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| All Patents in class 33/539 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 80,649 | Aug. 04, 1868 | B.F. Merrill | Improvement in Gauges | |
 | 133,086 | Nov. 19, 1872 | J. Donaldson | Key Way Gage | |
| 683,871 | Oct. 01, 1901 | J. Ackerly | Key Gage | ||