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1924-10-07 |
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morgan |
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1913-08-04 |
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1942-08-13 |
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1942-08-13 |
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Rotary hammering bit
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1944-10-02 |
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1947-07-08 |
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Mining planer
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1949-03-07 |
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1949-04-08 |
1956-07-24 |
Joy Mfg Co |
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1961-01-23 |
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Continuous mining machine with loading means
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1962-09-19 |
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Continuous mining machine of the oscillating head type
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1963-10-02 |
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1966-02-18 |
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1966-03-19 |
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1970-04-18 |
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1973-08-22 |
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Mining boom linkage for separate sump and swing cutting
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1975-09-29 |
1978-06-27 |
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Earth drilling knobby bit
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1976-05-13 |
1978-04-10 |
Voest Ag |
Schrammaschine
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1976-11-01 |
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Drag bit excavation
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1978-12-04 |
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H. B. Zachry Company |
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1978-12-06 |
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Multi-purpose mining machine
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1982-01-29 |
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Verfahren zum betrieb einer teilschnittmaschine und fuer das verfahren eingerichtete teilschnittmaschine
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1983-08-03 |
1985-02-21 |
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Mining machine
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1990-01-15 |
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