Mine roof support plate

Details Mine roof support plate Mine roof support plate

1978-08-21

1981-03-31

Bullock, B. J.

Tools and hardware

Fastener, support or mount not elsewhere specified

Fastener or coupling

D 8354, D0808

Patent

active

D02587181

REFERENCES:
patent: D34939 (1901-08-01), Taylor
patent: 2748594 (1956-06-01), Edwards
patent: 2854824 (1958-10-01), Curry et al.
"Handbook of Designs & Devices," by C. P. Hornung, .COPYRGT.1932, p. 24, quatrefoil configuration 212.

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