4. E - Fixed Constructions
  5. 21
  6. B

Rock drill feed mechanism

E - Fixed Constructions – 21 – B

Patent

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255/34

E21B 19/24 (2006.01)

Patent

CA 1001150

Boom Clarence O.

E - Fixed Constructions – 21 – B
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Roos Henry H.

E - Fixed Constructions – 21 – B
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Gardner-Denver Company

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Na

G - Physics – 21 – G
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