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| All Patents in class 192/226 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,254,229 | Sep. 02, 1941 | E. Lochman | Electric tracer-control machine for diesinking and the like | ||
| 2,556,318 | Jun. 12, 1951 | N.D. Cooper | Electrically Operated Sevopower Actuator | metalworking machine mechanisms | |
| 2,573,152 | Oct. 30, 1951 | L.A. Leifer | Forward and Reverse Drive for Lathe Spindles | metalworking machine mechanisms | |