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| All Patents in class 188/365 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,422,121 | Jun. 10, 1947 | J. Norstrom, A.L. Smith | Fluid pressure operated brake and adjustment therefor | ||
 | 2,538,997 | Jan. 23, 1951 | J.N. Weiland | Fluid clutch with pressure booster | |