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| All Patents in class 235/137 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,311,142 | Feb. 16, 1943 | F. Turrettini | Precision Machine Tool | |
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||
| 2,710,934 | Jun. 14, 1955 | J.A. Senn | Motor Controlled Machine Tool Positioning Mechanism | ||
| 2,748,665 | Jun. 05, 1956 | J.A. Sean | Machine Tool Positioning Mechanism | ||