Washer for mine roof bolt

Details Washer for mine roof bolt Washer for mine roof bolt

1996-10-07

1998-10-20

Bullock, B. J.

Tools and hardware

Fastener, support or mount not elsewhere specified

Fastener or coupling

0808

Patent

active

D03997308

REFERENCES:
patent: D31242 (1899-07-01), McAllister
patent: 2725843 (1955-12-01), Koski
patent: 2826108 (1958-06-01), Mills
patent: 4619559 (1986-10-01), Norris

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