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| All Patents in class 192/12D | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,003,351 | Jun. 04, 1935 | P.E. Eells | Power Control | |
| 2,706,544 | Apr. 19, 1955 | R.H. Schuman | Machine Tool Drive | ||
| 2,709,928 | Jun. 07, 1955 | G.H. Jones | Variable Speed Transmission | ||