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| All Patents in class 251/340 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 453,012 | May 26, 1891 | J.F. Lonergan | Cock or faucet | |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | ||
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | ||
| 4,416,338 | Nov. 22, 1983 | M.L. Foster, R.R. Zuzinec, J.W. Nelson | Control Mechanism for a Pneumatic Tool | ||