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| All Patents in class 91/468 | |||||
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| Number | Date | Patentee | Title | Type | |
| 568,395 | Sep. 29, 1896 | M.A. Yeakley | Pneumatic hammer | power hammers | |
| 2,000,420 | May 07, 1935 | L.L. Schauer, A.M. Sosa, J.H. McKewen | Hydraulic transmission system | radial drill presses | |