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| Patents for David Firth | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,605,660 | Aug. 05, 1952 | D. Firth | Quickly adjustable vise having safety stop | bench vises | |
| 2,672,064 | Mar. 16, 1954 | D. Firth | Screw and handle assembly | bench vises | |