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| All Patents in class 474/44 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,156,127 | Nov. 10, 1964 | D.D. Pettigrew | Vibration reducing device and method | |
| 3,608,387 | Sep. 28, 1971 | A. Fox | Centrifugally controlled, variable diameter pulley | ||