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- File:Patent-CH-24220.pdf + (24220)
- File:Patent-US-791466.pdf + (242210)
- File:Patent-GB-360918.pdf + (24239/30)
- File:Patent-DE-447802.pdf + (24276)
- File:Patent-CA-243009.pdf + (243009)
- File:Patent-GB-480965.pdf + (24327/36)
- File:Patent-GB-256814.pdf + (24332/25)
- File:Patent-US-1290365.pdf + (243320)
- File:Patent-GB-202183.pdf + (24350/22)
- File:Patent-US-1853316.pdf + (243504)
- File:Patent-US-1340277.pdf + (244351)
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- File:Patent-US-2189696.pdf + (245490)
- File:Patent-GB-616010.pdf + (24551/46)
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- File:Patent-US-2179727.pdf + (245817)
- File:Patent-US-1310235.pdf + (245974)
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- File:Patent-DE-248718.pdf + (248718)
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