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| All Patents in class 173/200 | |||||
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| Number | Date | Patentee | Title | Type | |
| 394,484 | Dec. 11, 1888 | G. Glossop | Pneumatic hammer | drop hammers | |
| 1,362,657 | Dec. 21, 1920 | W.S. Whyte | Tool Holder | tool holders | |