Screw driver bit

Details Screw driver bit Screw driver bit

1986-11-14

1990-11-13

Dunkins, Bruce W.

Tools and hardware

Other tools and implements

Screwdriver type

D 8 70, D15139

Patent

active

D03120341

REFERENCES:
patent: 539155 (1895-05-01), Tower
patent: 2550635 (1951-04-01), Brown et al.
patent: 2673359 (1954-03-01), Stellin
patent: 2815054 (1957-12-01), Cummaro
patent: 3122963 (1964-03-01), Borgeson
patent: 3363500 (1968-01-01), Simko
patent: 3913647 (1975-10-01), Arnn

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