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Patents for William R. Clarkson | |||||
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Number | Title | Classification(s) | |||
286,388 | Ratchet bit-brace | 279/56, 81/32 | |||
294,762 | Ratchet bit-brace | 192/43.1, 279/36, 81/31 | |||
301,339 | Bit-brace | 81/36, 81/37 |