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| All Patents in class 417/426 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,042,247 | May 26, 1936 | L.H. Blood | Machine Tool | metalworking power transmission | |
| 2,119,902 | Jun. 07, 1938 | L.H. Blood | Machine Tool Transmission and Control Mechanism | metal shapers | |