J-GLOBAL ID:201602015687937753   Reference number:58A0074900

Extra drill keeps shovels working at top production.

1台のドリルがショベルの最高能率を確保(2.5mileの道路延長工事でlngersoll-Rand Drillmasterが迅速に穴をあけ,大容量のショベルが最高能率で運転できるようにした)
Volume: 55  Issue:Page: 28-30  Publication year: 1958 
JST Material Number: B0316A  ISSN: 0010-7905  CODEN: CEGIA   Document type: Article
Country of issue: United States (USA) 
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