Ricerca semantica

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  • Year 1940, n° US-D127598, applied in 1941, by Clark Gower. Portamatite.
  • Year 1945, n° US-D143049, applied in 1947, by Maurice J. Waldinger. Matita meccanica.
  • Year 1945, n° US-D143176, applied in 1945, by John N. Whitehouse. Penna stilografica.
  • Year 1946, n° US-D147107, applied in 1947, by Charles T. Breitenstein. Penna a sfera.
  • Year 1946, n° US-D147982, applied in 1947, by Robert J. Lynn. Matita meccanica.
  • Year 1947, n° US-D151661, applied in 1948, by John M. Sherrer. Matita meccanica con calendario.
  • Year 1947, n° US-D151989, applied in 1948, by Mahlon Edward Hirsch. Penna a sfera.
  • Year 1951, n° US-D163686, applied in 1951, by Mendel Fried. Cappuccio per stilografica.