Supports – Machinery support – Movable machine
Patent
1978-12-18
1981-04-28
Foss, J. Franklin
Supports
Machinery support
Movable machine
173 43, 173 52, 248654, F21C 110, E21C 500
Patent
active
042640512
ABSTRACT:
Drilling equipment comprises a single boom supporting a plurality of drilling masts each provided with a drilling machine, adjustment means being provided to simultaneously adjust the relative positions of the drilling masts.
REFERENCES:
patent: 2675996 (1954-04-01), Gunning
patent: 2731235 (1956-01-01), Dellner
patent: 3295800 (1967-01-01), Quarnstrom
patent: 3493200 (1970-02-01), Huffman
Aldridge William R.
Walmsley Stanley
Coal Industry (Patents) Limited
Foss J. Franklin
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