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| Patents for Otto A. G. Specht | |||||
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| Number | Title | Classification(s) | |||
| 3,130,611 | Swaging Machine | 72/400, 72/402, 72/415, 72/78, 72/80 | |||
| 3,222,912 | Swaging Machine with Adjustable Stroke | 72/402 | |||