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| All Patents in class 33/651 | |||||
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| Number | Date | Patentee | Title | Type | |
| 486,810 | Nov. 22, 1892 | J.W. Porter | Automatic Indicating Calipers | indicating calipers | |
| 725,411 | Apr. 14, 1903 | J.O. Robinson, F.J. Compliment | Axle Gage | special purpose gauges | |