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- File:Patent-NL-300030.pdf + (300030)
- File:Patent-US-821940.pdf + (301551)
- File:Patent-US-804847.pdf + (301551)
- File:Patent-US-836180.pdf + (302441)
- File:Patent-US-834542.pdf + (302554)
- File:Patent-US-825442.pdf + (302841)
- File:Patent-DE-1786449.pdf + (3034)
- File:Patent-GB-484593.pdf + (30368/36)
- File:Patent-US-2267147.pdf + (304174)
- File:Patent-US-2293343.pdf + (304496)
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- File:Patent-CH-305143.pdf + (305143)
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- File:Patent-US-2241850.pdf + (306264)
- File:Patent-US-846547.pdf + (306494)
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