Machines not elsewhere specified – Agricultural or construction machinery – Drilling – mining – or soil treatment
Patent
1988-06-27
1990-12-18
Bullock, B. J.
Machines not elsewhere specified
Agricultural or construction machinery
Drilling, mining, or soil treatment
Patent
active
D03130258
REFERENCES:
patent: 2774569 (1956-12-01), Jacobsen
patent: 4399622 (1983-08-01), Howard
The Oil Engine & Gas Turbine, p. 228, Nov. 1962, figure in middle of page.
Bullock B. J.
Morris Sandra
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