Drill bit for retrieving broken bolts

Details Drill bit for retrieving broken bolts Drill bit for retrieving broken bolts

1991-12-05

1994-03-29

Holtje, Nelson C.

Tools and hardware

Other tools and implements

Film splicer or cutter

Patent

active

D03454959

REFERENCES:
patent: D318227 (1991-07-01), Halm
patent: 4713990 (1987-12-01), Poiling
patent: 4777850 (1988-10-01), Polonsky
patent: 4831902 (1989-05-01), McClure
Illinois cat. dated May 24, 1965, p. 28 Drill bit series No. 73400.

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