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All Patents in class 180/9.23 | |||||
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Number | Title | Classification(s) | |||
334,333 | Traction Engine | 104/244.1, 122/109, 172/26, 172/280, 172/292, 172/834, 180/36, 180/8.7, 180/9.23, 180/9.62, 305/130 |