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Elenco dei risultati
- File:Patent-US-1808045.pdf + (Henry Krause)
- File:Patent-US-1840110.pdf + (Henry Krause)
- File:Patent-US-1923734.pdf + (Henry Krause)
- File:Patent-US-1863016.pdf + (Henry Krause)
- File:Patent-US-2012722.pdf + (Henry Krause)
- File:Patent-US-D156633.pdf + (Henry Krause)
- File:Patent-US-1284718.pdf + (Henry Lasko)
- File:Patent-US-2087672.pdf + (Gabriel Larsen)
- File:Patent-US-1124592.pdf + (Henry R. Coit)
- File:Patent-GB-439182.pdf + (Arthur E. Andrews)
- File:Patent-US-087661.pdf + (Henry S. Goodspeed)
- File:Patent-US-D124266.pdf + (Henry Zoll)
- File:Patent-GB-885375.pdf + (Herbert Gesaja Ochs)
- File:Patent-GB-885374.pdf + (Herbert Gesaja Ochs)
- File:Patent-US-1557357.pdf + (Herbert Gornell)
- File:Patent-FR-574169.pdf + (Herbert Gornell)
- File:Patent-GB-207904.pdf + (Herbert Gornell)
- File:Patent-GB-190929406.pdf + (Herbert Gornell)
- File:Patent-GB-191316916.pdf + (Herbert Gornell)
- File:Patent-US-2003479.pdf + (Herbert L. Carman)
- File:Patent-US-1489590.pdf + (Herbert L. Carman)
- File:Patent-US-D086826.pdf + (Herbert L. Carman)
- File:Patent-US-1304739.pdf + (Herbert L. Carman)
- File:Patent-US-1832170.pdf + (Herman B. Wilson)
- File:Patent-US-2580753.pdf + (Herman C. Frentzel)
- File:Patent-US-2241865.pdf + (Lynn P. Martin)
- File:Patent-US-1852094.pdf + (Herman K. Stempel)
- File:Patent-US-2113633.pdf + (Herman K. Stempel)
- File:Patent-US-2177466.pdf + (Herman K. Stempel)
- File:Patent-US-2180560.pdf + (Herman K. Stempel)
- File:Patent-US-2314563.pdf + (Herman K. Stempel)
- File:Patent-US-2588015.pdf + (Herman Kochendoerffer)
- File:Patent-US-1977527.pdf + (Herman Pohle)
- File:Patent-CH-81788.pdf + (Hermann Burkhardt)
- File:Patent-CH-107012.pdf + (Arnold Roggen)
- File:Patent-CH-117009.pdf + (Hermann Burkhardt)
- File:Patent-BE-337528.pdf + (Hermann Burkhardt)
- File:Patent-GB-260304.pdf + (Hermann Burkhardt)
- File:Patent-DE-803094.pdf + (Hermann Mayr)
- File:Patent-US-295395.pdf + (Hezekiah Hewitt)
- File:Patent-US-1321188.pdf + (Homer Catucci)
- File:Patent-US-2148853.pdf + (Homer J. Bessette)
- File:Patent-US-3134362.pdf + (Homer T. Green)
- File:Patent-US-D196993.pdf + (Homer T. Green)
- File:Patent-US-D188637.pdf + (Homer T. Green)
- File:Patent-US-D195385.pdf + (Homer T. Green)
- File:Patent-US-D223130.pdf + (Homer T. Green)
- File:Patent-US-D220663.pdf + (Homer T. Green)
- File:Patent-US-1457011.pdf + (Horace H. Welch)
- File:Patent-US-1669036.pdf + (Horace L. Blackman)
- File:Patent-US-1629987.pdf + (Horace L. Blackman)
- File:Patent-US-1782597.pdf + (Horace L. Blackman)
- File:Patent-US-1705656.pdf + (Horace L. Blackman)
- File:Patent-US-1892499.pdf + (Horace L. Blackman)
- File:Patent-US-RE17282.pdf + (Horace L. Blackman)
- File:Patent-US-1606930.pdf + (Howard L. Fischer)
- File:Patent-US-2215630.pdf + (Howard S. Wright)
- File:Patent-US-2158615.pdf + (Howard S. Wright)
- File:Patent-US-2101304.pdf + (Howard S. Wright)
- File:Patent-US-2011516.pdf + (Hugo A. Funk)
- File:Patent-US-1367255.pdf + (Hugo S. Hasselquist)
- File:Patent-US-1325844.pdf + (Hugo S. Hasselquist)
- File:Patent-DE-268612.pdf + (Hugo Stein)
- File:Patent-US-802668.pdf + (Huston Taylor)
- File:Patent-US-756076.pdf + (Huston Taylor)
- File:Patent-US-738859.pdf + (Huston Taylor)
- File:Patent-US-1737948.pdf + (Ignatz Salz)
- File:Patent-DE-152729.pdf + (Ignaz Timar)
- File:Patent-US-750928.pdf + (Irving G. Woodward)
- File:Patent-US-1594740.pdf + (Isaia Levi)
- File:Patent-GB-245448.pdf + (Isaia Levi)
- File:Patent-US-1737463.pdf + (Isaia Levi)
- File:Patent-GB-288176.pdf + (Isaia Levi)
- File:Patent-GB-303699.pdf + (Isaia Levi)
- File:Patent-GB-351734.pdf + (Isaia Levi)
- File:Patent-US-2432061.pdf + (Isidor Chesler)
- File:Patent-US-1446524.pdf + (Ivan D. Tefft)
- File:Patent-US-1624190.pdf + (Ivan D. Tefft)
- File:Patent-US-1605151.pdf + (Ivan D. Tefft)
- File:Patent-US-1980508.pdf + (Ivan D. Tefft)
- File:Patent-US-2031343.pdf + (Ivan D. Tefft)
- File:Patent-US-1853876.pdf + (Kenneth S. Parker)
- File:Patent-US-1892181.pdf + (Ivan D. Tefft)
- File:Patent-US-1920770.pdf + (Ivan D. Tefft)
- File:Patent-US-1956084.pdf + (Ivan D. Tefft)
- File:Patent-US-2464104.pdf + (Ivan D. Tefft)
- File:Patent-US-2110007.pdf + (Ivan D. Tefft)
- File:Patent-US-2774332.pdf + (Ivan D. Tefft)
- File:Patent-US-2286878.pdf + (Ivan D. Tefft)
- File:Patent-US-2452504.pdf + (Ivan D. Tefft)
- File:Patent-US-2503080.pdf + (Ivan D. Tefft)
- File:Patent-US-2702021.pdf + (Ivan D. Tefft)
- File:Patent-US-D089815.pdf + (Ivan D. Tefft)
- File:Patent-US-RE16349.pdf + (Ivan D. Tefft)
- File:Patent-US-D088821.pdf + (Joseph B. Platt)
- File:Patent-US-D107708.pdf + (Paul M. Ressinger)
- File:Patent-DE-248718.pdf + (Jacob Kaufmann)
- File:Patent-US-1263808.pdf + (Jacob Salz)
- File:Patent-US-979606.pdf + (Jacob Ullrich)
- File:Patent-US-2681041.pdf + (Harlan H. Zodtner)
- File:Patent-US-2620774.pdf + (James A. Mustard)
- File:Patent-US-2484640.pdf + (James A. Mustard)
- File:Patent-FR-951555.pdf + (Harlan H. Zodtner)
- File:Patent-US-D011737.pdf + (James C. Aikin)
- File:Patent-US-D010984.pdf + (James C. Aikin)
- File:Patent-US-D011806.pdf + (James C. Aikin)
- File:Patent-US-D011457.pdf + (James C. Aikin)
- File:Patent-US-2318950.pdf + (James J. Larmour)
- File:Patent-US-D085655.pdf + (James J. Larmour)
- File:Patent-GB-330144.pdf + (James Jeff)
- File:Patent-GB-424069.pdf + (James Jeff)
- File:Patent-US-1216732.pdf + (James M. Reed)
- File:Patent-US-298767.pdf + (James Morton)
- File:Patent-US-873769.pdf + (James P. Morris)
- File:Patent-US-1777736.pdf + (James Salz)
- File:Patent-US-776951.pdf + (James Sinnot)
- File:Patent-US-1098719.pdf + (James W. Greenbaum)
- File:Patent-US-1116078.pdf + (Adolf Klein)
- File:Patent-US-1042695.pdf + (James W. Laughlin)
- File:Patent-US-1042804.pdf + (James W. Laughlin)
- File:Patent-US-559034.pdf + (James W. Laughlin)
- File:Patent-US-2456602.pdf + (James W. Welsh)
- File:Patent-US-2200042.pdf + (Jaque A. Salz)
- File:Patent-US-2093701.pdf + (Jaroslav Zahel)
- File:Patent-US-739720.pdf + (Jay G. Rider)
- File:Patent-US-919244.pdf + (Jay G. Rider)
- File:Patent-US-1264684.pdf + (Jay G. Rider)
- File:Patent-GB-169616.pdf + (Jean-Marie Cavaillé)
- File:Patent-FR-530688.pdf + (Jean-Marie Cavaillé)
- File:Patent-US-733491.pdf + (Jessie I. Litchfield)
- File:Patent-DK-52984.pdf + (Johannes Iversen)
- File:Patent-US-2143601.pdf + (Johannes Iversen)
- File:Patent-CH-197313.pdf + (Johannes Iversen)
- File:Patent-GB-466012.pdf + (Johannes Iversen)
- File:Patent-BE-426288.pdf + (Johannes Iversen)
- File:Patent-FR-822646.pdf + (Johannes Iversen)
- File:Patent-NL-43662.pdf + (Johannes Iversen)
- File:Patent-GB-189923550.pdf + (Johannes Paul Steinbach)
- File:Patent-US-821940.pdf + (John A. Holland)
- File:Patent-US-1876298.pdf + (John A. Holland)
- File:Patent-US-683763.pdf + (John A. Holland)
- File:Patent-US-703418.pdf + (John A. Holland)
- File:Patent-US-804847.pdf + (John A. Holland)
- File:Patent-US-863029.pdf + (John A. Holland)
- File:Patent-US-885753.pdf + (John A. Holland)
- File:Patent-US-1152509.pdf + (John A. Holland)
- File:Patent-US-211575.pdf + (John A. Holland)
- File:Patent-US-202655.pdf + (John A. Holland)
- File:Patent-US-269290.pdf + (John A. Holland)
- File:Patent-US-202654.pdf + (John A. Holland)
- File:Patent-US-258299.pdf + (John A. Holland)
- File:Patent-US-132008.pdf + (John A. Holland)
- File:Patent-US-180715.pdf + (John A. Holland)
- File:Patent-US-351033.pdf + (John A. Holland)
- File:Patent-US-275912.pdf + (John A. Holland)
- File:Patent-US-159513.pdf + (John A. Holland)
- File:Patent-US-258298.pdf + (John A. Holland)
- File:Patent-US-279388.pdf + (John A. Holland)
- File:Patent-US-292313.pdf + (John A. Holland)
- File:Patent-US-298582.pdf + (John A. Holland)
- File:Patent-US-426813.pdf + (John A. Holland)
- File:Patent-US-415838.pdf + (John A. Holland)
- File:Patent-US-485795.pdf + (John A. Holland)
- File:Patent-US-118367.pdf + (John A. Holland)
- File:Patent-US-135118.pdf + (John A. Holland)
- File:Patent-US-241216.pdf + (John A. Holland)
- File:Patent-US-285895.pdf + (John A. Holland)
- File:Patent-US-2149557.pdf + (John A. Snodgrass)
- File:Patent-US-734116.pdf + (John Blair)
- File:Patent-US-1351552.pdf + (John Bricken)
- File:Patent-US-D181705.pdf + (John Bruce)
- File:Patent-US-D185263.pdf + (John Bruce)
- File:Patent-US-940247.pdf + (John C. Haring)
- File:Patent-US-1735224.pdf + (John C. Wahl)
- File:Patent-US-2427243.pdf + (John C. Wahl)
- File:Patent-US-1613812.pdf + (John C. Wahl)
- File:Patent-US-1779836.pdf + (John C. Wahl)
- File:Patent-US-1351591.pdf + (John C. Wahl)
- File:Patent-US-1365754.pdf + (John C. Wahl)
- File:Patent-US-1415211.pdf + (John C. Wahl)
- File:Patent-US-1395316.pdf + (John C. Wahl)
- File:Patent-US-1279186.pdf + (John C. Wahl)
- File:Patent-US-1562267.pdf + (John C. Wahl)
- File:Patent-US-1490686.pdf + (John C. Wahl)
- File:Patent-US-1585805.pdf + (John C. Wahl)
- File:Patent-US-1613810.pdf + (John C. Wahl)
- File:Patent-US-1334332.pdf + (John C. Wahl)
- File:Patent-US-1349025.pdf + (John C. Wahl)
- File:Patent-US-1465957.pdf + (John C. Wahl)
- File:Patent-US-1490244.pdf + (John C. Wahl)
- File:Patent-US-1567823.pdf + (John C. Wahl)
- File:Patent-US-1567824.pdf + (John C. Wahl)
- File:Patent-US-1574266.pdf + (John C. Wahl)
- File:Patent-US-1586541.pdf + (John C. Wahl)
- File:Patent-US-1624194.pdf + (John C. Wahl)
- File:Patent-US-1800330.pdf + (John C. Wahl)
- File:Patent-US-1506795.pdf + (John C. Wahl)
- File:Patent-US-2427033.pdf + (John C. Wahl)
- File:Patent-US-2483329.pdf + (John C. Wahl)
- File:Patent-US-D056681.pdf + (John C. Wahl)
- File:Patent-US-D058693.pdf + (John C. Wahl)
- File:Patent-US-D057403.pdf + (John C. Wahl)
- File:Patent-US-D057404.pdf + (John C. Wahl)
- File:Patent-US-D057405.pdf + (John C. Wahl)
- File:Patent-US-D058516.pdf + (John C. Wahl)
- File:Patent-US-1301341.pdf + (John C. Wahl)
- File:Patent-US-1490245.pdf + (John C. Wahl)
- File:Patent-US-1490246.pdf + (John C. Wahl)
- File:Patent-US-1490247.pdf + (John C. Wahl)
- File:Patent-US-1782108.pdf + (John C. Wahl)
- File:Patent-US-RE16145.pdf + (John C. Wahl)
- File:Patent-US-1428195.pdf + (John C. Wahl)
- File:Patent-US-1506207.pdf + (John C. Wahl)
- File:Patent-US-1574457.pdf + (John C. Wahl)
- File:Patent-US-1578565.pdf + (John C. Wahl)
- File:Patent-CA-234983.pdf + (John D. Turner)
- File:Patent-US-1469921.pdf + (John Dutchak)
- File:Patent-US-1335580.pdf + (John E. Hayes)
- File:Patent-US-1867932.pdf + (John E. Wahl)
- File:Patent-GB-164043.pdf + (John Edward Hayes)
- File:Patent-US-1791776.pdf + (John Estabrook Wahl)
- File:Patent-GB-190400459.pdf + (John Everard Langill)
- File:Patent-US-1809416.pdf + (John G. Liddel)
- File:Patent-US-1425871.pdf + (John G. Liddel)
- File:Patent-US-1556701.pdf + (John G. Liddel)
- File:Patent-US-1482568.pdf + (John H. Kritikson)
- File:Patent-CA-255206.pdf + (John H. Kritikson)
- File:Patent-US-2258030.pdf + (John H. Oxley)
- File:Patent-US-D058694.pdf + (John H. Worthy)
- File:Patent-US-D059052.pdf + (John H. Worthy)
- File:Patent-US-D096914.pdf + (John Hill)
- File:Patent-US-1531800.pdf + (John J. Lynagh)
- File:Patent-GB-114801.pdf + (John James)
- File:Patent-US-1339359.pdf + (John Kritikson)
- File:Patent-US-1372011.pdf + (John L. De Maria)
- File:Patent-US-D151661.pdf + (John M. Sherrer)
- File:Patent-US-11762.pdf + (John Mabie)
- File:Patent-US-D143176.pdf + (John N. Whitehouse)
- File:Patent-US-836905.pdf + (John N. Whitehouse)
- File:Patent-US-448360.pdf + (John Oliphant)
- File:Patent-GB-586917.pdf + (John Pinkney Gowland)
- File:Patent-US-726495.pdf + (John S. Barnes)
- File:Patent-US-474940.pdf + (John S. Barnes)
- File:Patent-US-844575.pdf + (John S. Barnes)
- File:Patent-US-844576.pdf + (John S. Barnes)
- File:Patent-US-848620.pdf + (John S. Barnes)
- File:Patent-US-716489.pdf + (John Slater)
- File:Patent-US-1408545.pdf + (John Straka)
- File:Patent-US-787152.pdf + (John T. Davison)
- File:Patent-GB-190400459.pdf + (John Everard Langill)
- File:Patent-US-D118872.pdf + (John Vassos)
- File:Patent-US-D118873.pdf + (John Vassos)
- File:Patent-US-2365473.pdf + (David Kahn)
- File:Patent-US-2377444.pdf + (John William Para)
- File:Patent-US-2293621.pdf + (John William Para)
- File:Patent-US-2293622.pdf + (John William Para)
- File:Patent-US-2293623.pdf + (John William Para)
- File:Patent-US-2312928.pdf + (John William Para)
- File:Patent-US-2337343.pdf + (John William Para)
- File:Patent-US-2339290.pdf + (John William Para)
- File:Patent-US-2339860.pdf + (David Kahn)
- File:Patent-US-2548906.pdf + (John William Para)
- File:Patent-GB-688902.pdf + (Jonh George Burnham)
- File:Patent-US-2756722.pdf + (Josef C. Lamy)
- File:Patent-US-3539267.pdf + (Josef C. Lamy)
- File:Patent-DE-907750.pdf + (Josef C. Lamy)
- File:Patent-DE-570012.pdf + (Josef C. Lamy)
- File:Patent-DE-863767.pdf + (Josef C. Lamy)
- File:Patent-DE-824455.pdf + (Josef C. Lamy)
- File:Patent-DE-851465.pdf + (Josef C. Lamy)
- File:Patent-DE-873365.pdf + (Josef C. Lamy)
- File:Patent-DE-854167.pdf + (Josef C. Lamy)
- File:Patent-DE-827908.pdf + (Josef C. Lamy)
- File:Patent-DE-809514.pdf + (Josef C. Lamy)
- File:Patent-DE-856114.pdf + (Josef C. Lamy)
- File:Patent-DE-974635.pdf + (Josef C. Lamy)
- File:Patent-CH-350570.pdf + (Josef C. Lamy)
- File:Patent-DE-1034066.pdf + (Josef C. Lamy)
- File:Patent-DE-1004522.pdf + (Josef C. Lamy)
- File:Patent-DE-936914.pdf + (Josef C. Lamy)
- File:Patent-DE-840521.pdf + (Josef C. Lamy)
- File:Patent-DE-845322.pdf + (Josef C. Lamy)
- File:Patent-DE-1008147.pdf + (Josef C. Lamy)
- File:Patent-DE-907749.pdf + (Josef C. Lamy)
- File:Patent-DE-926653.pdf + (Josef C. Lamy)
- File:Patent-DE-1026662.pdf + (Josef C. Lamy)
- File:Patent-DE-1718469U.pdf + (Josef C. Lamy)
- File:Patent-DE-1696470U.pdf + (Josef C. Lamy)
- File:Patent-DE-867213.pdf + (Josef C. Lamy)
- File:Patent-DE-867212.pdf + (Josef C. Lamy)
- File:Patent-DE-801614.pdf + (Josef Ganter)
- File:Patent-US-1124750.pdf + (Joseph A. Kracker)
- File:Patent-US-1170825.pdf + (Joseph A. Kracker)
- File:Patent-US-1007619.pdf + (Joseph A. Vogelmann)
- File:Patent-US-D088821.pdf + (Joseph B. Platt)
- File:Patent-US-1853316.pdf + (Oscar F. Nilsson)
- File:Patent-US-1902091.pdf + (Oscar F. Nilsson)
- File:Patent-US-D182164.pdf + (Joseph Carreiro)
- File:Patent-US-D182162.pdf + (Joseph Carreiro)
- File:Patent-US-D182163.pdf + (Joseph Carreiro)
- File:Patent-US-686920.pdf + (Joseph F. Betzler)
- File:Patent-US-799297.pdf + (Joseph F. Betzler)
- File:Patent-US-1495890.pdf + (Joseph F. Day)
- File:Patent-US-1080197.pdf + (Joseph G. Coffin)
- File:Patent-US-2409869.pdf + (Joseph J. Kelley)
- File:Patent-US-976815.pdf + (Joseph Lipic)
- File:Patent-FR-691384.pdf + (Joseph Michel Alphonse Luis Carre)
- File:Patent-BE-371161.pdf + (Joseph Michel Alphonse Luis Carre)
- File:Patent-US-122047.pdf + (Joseph Monaghan)
- File:Patent-AT-85902.pdf + (Joseph Müller)
- File:Patent-US-1020221.pdf + (Joseph Rauchenecker)
- File:Patent-US-D150320.pdf + (Joseph Starr)
- File:Patent-US-2418218.pdf + (Hans A. Bauer)
- File:Patent-US-D142751.pdf + (Joseph Tully)
- File:Patent-CA-477244.pdf + (Joseph Tully)
- File:Patent-US-1943048.pdf + (Joseph Wallace)
- File:Patent-US-2356109.pdf + (Joseph Wallace)
- File:Patent-US-2217502.pdf + (Joseph Wallace)
- File:Patent-US-2111518.pdf + (Joseph Wallace)
- File:Patent-US-955517.pdf + (Joseph Warren Kessel)
- File:Patent-US-2519675.pdf + (Joshua G. Lippincott)
- File:Patent-US-D146181.pdf + (Joshua Gordon Lippincott)
- File:Patent-US-1999966.pdf + (José Andrés y Hernandez)
- File:Patent-US-2397229.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-2400679.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-2491082.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-2258841.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-2413904.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-2435123.pdf + (Jozsef Laszlo Biro)
- File:Patent-US-1641846.pdf + (Jules A. Fremon)
- File:Patent-US-1675543.pdf + (Jules A. Fremon)
- File:Patent-US-1782109.pdf + (Jules A. Fremon)
- File:Patent-US-1574919.pdf + (Julian H. Murdock)
- File:Patent-US-1134936.pdf + (Julius Abegg)
- File:Patent-US-1745483.pdf + (Julius F. Hansen)
- File:Patent-US-2009182.pdf + (Julius Kahn)
- File:Patent-US-2249004.pdf + (David Kahn)
- File:Patent-US-1144436.pdf + (Julius L. Schnell)
- File:Patent-US-D073416.pdf + (Julius L. Schnell)
- File:Patent-US-776428.pdf + (Julius L. Schnell)
- File:Patent-US-1060137.pdf + (Julius L. Schnell)
- File:Patent-US-1053879.pdf + (Julius L. Schnell)
- File:Patent-US-1357083.pdf + (Julius L. Schnell)
- File:Patent-FR-479060.pdf + (Julius L. Schnell)
- File:Patent-US-2120652.pdf + (Julius L. Schnell)
- File:Patent-US-1895736.pdf + (Julius L. Schnell)
- File:Patent-US-2964012.pdf + (Julius M. Kahn)
- File:Patent-DE-265018.pdf + (Justin Gilbert)
- File:Patent-DK-25155C.pdf + (Jörgen Thorvald Andersen)
- File:Patent-US-1336119.pdf + (Jörgen Thorvald Andersen)
- File:Patent-GB-127562.pdf + (Jörgen Thorvald Andersen)
- File:Patent-AT-81466B.pdf + (Jörgen Thorvald Andersen)
- File:Patent-DE-326796.pdf + (Jörgen Thorvald Andersen)
- File:Patent-FR-497658.pdf + (Jörgen Thorvald Andersen)
- File:Patent-DK-25360C.pdf + (Jörgen Thorvald Andersen)
- File:Patent-GB-380267.pdf + (Kabushiki Kaisha Namiki Seisakusho)
- File:Patent-GB-410437.pdf + (Kabushiki Kaisha Namiki Seisakusho)
- File:Patent-GB-450343.pdf + (Kabushiki Kaisha Namiki Seisakusho)
- File:Patent-GB-387844.pdf + (Kabushiki Kaisha Namiki Seisakusho)
- File:Patent-GB-359830.pdf + (Kabushiki Kaisha Namiki Seisakusho)
- File:Patent-FR-826105.pdf + (Kabushikikaisha Namiki Seisaku)
- File:Patent-NL-48900.pdf + (Kabushikikaisha Namiki Seisakusho)
- File:Patent-CH-24220.pdf + (Georg Fend)
- File:Patent-GB-220435.pdf + (Karl Fend)
- File:Patent-FR-570444.pdf + (Karl Fend)
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