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| All Patents in class 74/525 | |||||
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| Number | Date | Patentee | Title | Type | |
| 284,703 | Sep. 11, 1883 | G.H. Zschech | Belt-tightener | industrial machine pulleys and belt drive mechanisms | |
| 2,912,879 | Nov. 17, 1959 | R.F. Bannow | Variable Leverage Joy Stick for Feeding Work | machine tool controls | |