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

Well perforator

E - Fixed Constructions – 21 – B

Patent

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166/12

E21B 29/02 (2006.01)

Patent

CA 705707

Larsen Richard W.

E - Fixed Constructions – 21 – B
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Russell Herbert R.

E - Fixed Constructions – 21 – B
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Borg-Warner Corporation

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G - Physics – 21 – G
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