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| All Patents in class 173/221 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,099,392 | Jun. 09, 1914 | R.A. Norling | Pneumatic-turbine drill | pneumatic tools | |
| 1,329,571 | Feb. 03, 1920 | A.G. Adair | Nut Turning Tool | pneumatic tools | |
| 3,696,834 | Oct. 10, 1972 | W. Vonhoff, Jr. | Fluid control device | ||
| 6,062,323 | May 16, 2000 | J.M. Beer, J.R. Brehm, D.S. Pusateri | Pneumatic Tool with Increased Power Capability | ||