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| All Patents in class 188/170 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,561,722 | Nov. 17, 1925 | F.A. Jimerson | Motor | pneumatic motors | |
| 2,778,456 | Jan. 22, 1957 | J.L. Ross | Disk Type Brake | industrial friction brakes | |