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Lightweight fiberglass feed leg for hand-held pneumatic percussion rock drills / by Ellsworth R. Spencer.

By: Material type: TextTextSeries: Information circular (United States. Bureau of Mines) ; 9047Publication details: Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1985.Description: 6 p. : ill. ; 28 cmSubject(s): DDC classification:
  • 622 s
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