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| All Patents in class 173/209 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,090,842 | Aug. 24, 1937 | M. Kiecksee | Ramming machine driven by internal combustion | handheld power hammers | |
| 2,433,007 | Dec. 23, 1947 | C.S. Weyandt | Internal-combustion percussion tool | gas and gasoline engines | |