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

Improved ball injector

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/068 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2688639

Matzner Mark D.

F - Mech Eng,Light,Heat,Weapons – 04 – B
Inventor

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Witkowski Brian C.

E - Fixed Constructions – 21 – B
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Finlayson & Singlehurst

F - Mech Eng,Light,Heat,Weapons – 22 – B
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Weir Spm Inc.

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