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- File:Patent-US-1892509.pdf + (160596)
- File:Patent-GB-439182.pdf + (16108/34)
- File:Patent-US-736710.pdf + (161169)
- File:Patent-GB-352184.pdf + (16147/30)
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- File:Patent-GB-469699.pdf + (16200/36)
- File:Patent-US-2132313.pdf + (162018)
- File:Patent-AT-162116.pdf + (162116)
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