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| All Patents in class 173/211 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,446,547 | Feb. 27, 1923 | J.M. Crowe | Valve for pneumatic tools | pneumatic tools | |
| 3,783,970 | Jan. 08, 1974 | I.R. Danielson | Sound Attenuating device for a work steel or the like | ||
| 6,158,526 | Dec. 12, 2000 | R.D. DeRome, P.W. Griffin, A.P. Ghode | Reversible Impact Mechanism with Structure Limiting Hammer Travel | ||
| 6,227,308 | May 08, 2001 | R.D. DeRome, P.W. Griffin, A.P. Ghode | Reversible Impact Mechanism with Structure Limiting Hammer Travel | ||