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

Rock drill

E - Fixed Constructions – 21 – B

Patent

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Details

255/44

E21B 1/38 (2006.01)

Patent

CA 376443

Morris Charles

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Inventor

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G - Physics – 21 – G
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National Rock Drill Company

E - Fixed Constructions – 21 – B
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