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| All Patents in class 91/316 | |||||
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| Number | Date | Patentee | Title | Type | |
| 464,820 | Dec. 08, 1891 | D. Drawbaugh | Pneumatic Tool for rock-cutting | ||
| 649,754 | May 15, 1900 | C.B. Richards | Pneumatic Tool | pneumatic tools | |