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| All Patents in class 173/121 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,031,535 | Feb. 18, 1936 | E. Kiecksee | Ram | handheld power hammers | |
| 2,090,842 | Aug. 24, 1937 | M. Kiecksee | Ramming machine driven by internal combustion | handheld power hammers | |
| 2,423,821 | Jul. 15, 1947 | E.P. Anstett | Flooring nailer | nailing machines | |
| 2,561,093 | Jul. 17, 1951 | V.W. Breitenstein, E.R. Boddinghouse | Internal-combustion rammer | handheld power tools | |