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Publication numberUS2946578 A
Publication typeGrant
Publication dateJul 26, 1960
Filing dateFeb 25, 1957
Priority dateAug 4, 1952
Publication numberUS 2946578 A, US 2946578A, US-A-2946578, US2946578 A, US2946578A
InventorsDe Smaele Albert
Original AssigneeDe Smaele Albert
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Excavator apparatus having stepper type advancing means
US 2946578 A
Images(20)
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Description  (OCR text may contain errors)

July 26, 1960 A. DE sMAl-:LE

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Patent Citations
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US2699328 *Apr 2, 1949Jan 11, 1955Union Carbide & Carbon CorpMining process and system by remote control
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Classifications
U.S. Classification299/1.3, 175/62, 175/319, 175/99, 175/94, 175/104, 299/58, 175/392, 299/12, 299/60, 175/76
International ClassificationE21B4/00, E21B4/18, E21D9/10
Cooperative ClassificationE21B4/18, E21D9/1093
European ClassificationE21B4/18, E21D9/10M