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| All Patents in class 60/537 | |||||
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| Number | Date | Patentee | Title | Type | |
| 707,246 | Aug. 19, 1902 | H.F. Massey | Pneumatic power-hammer | power hammers | |
| 2,127,877 | Aug. 23, 1938 | G.F. Maglott | Grinding Machine | ||