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| All Patents in class 91/308 | |||||
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| Number | Date | Patentee | Title | Type | |
| 803,621 | Nov. 07, 1905 | A.J. Patch | Pneumatic Hammer | pneumatic tools | |
| 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | drop hammers | |