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| All Patents in class 269/221 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,565,965 | Aug. 28, 1951 | P. Hartmann | Cam for sliding screw-operated vise jaws to final clamping position | machinist vises | |
| 2,623,560 | Dec. 30, 1952 | A.H. Joseph | Polygonal framework type clamping machine | clamps | |
| 4,299,377 | Nov. 10, 1981 | J.O. Lenz | Manually operated clamp effort intensifier for vise | machinist vises | |