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| All Patents in class 188/312 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,689X | Jun. 02, 1836 | S. Cram | Hydrostatic and pneumatic breaker | ||
| 2,574,751 | Nov. 13, 1951 | V.R. Noll | Engine for producing reciprocatory motion having substantially constant velocity except during reversals | debarking machines | |