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| Patents for PROTO | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,007,432 | Jul. 09, 1935 | E. Mancuso | Combination Screw Driver and Socket Wrench Tool | combination tools | |
| 2,310,759 | Feb. 09, 1943 | I.C. Clawson | Drill with Adjustable Head | eggbeater drills | |
| 2,600,512 | Jun. 17, 1952 | H.A. Mead | Adjustable Pliers | pliers | |
| 2,905,037 | Sep. 22, 1959 | C.W. Coslow | Worm Locking Means For Adjustable Jaw Wrench | wrench adjustment locks | |
| 3,119,290 | Jan. 28, 1964 | R.G. Ivie | Work Gripping Wrench Socket | socket wrenches | |