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| All Patents in class 411/508 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,890,072 | Jun. 09, 1959 | P.E. Vega, F.A. Kaman | Retainer for rotary power tools | ||
| 3,092,175 | Jun. 04, 1963 | J.F. Suessle | Fastening device | ||