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| Patents for William R. Pitkin | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-74,212 | Dec. 24, 1901 | W.A. Bernard | Nippers, Pliers, etc. | pliers | |
| 734,157 | Jul. 21, 1903 | W.A. Bernard | Punch | leather punches | |
| 750,678 | Jan. 26, 1904 | W.M. Morton | Pliers, Punch & c. | pliers | |
| 753,224 | Mar. 01, 1904 | W.A. Bernard | Improvement in Pliers and Similar Tools | pliers | |
| 801,965 | Oct. 17, 1905 | W.A. Bernard | Dividers | dividers | |
| 848,877 | Apr. 02, 1907 | W.A. Bernard | Pliers, Punch and Similar Tool | pliers | |