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

Mine door installation

E - Fixed Constructions – 21 – F

Patent

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Details

E21F 1/10 (2006.01) E05F 15/04 (2006.01) E21F 1/12 (2006.01)

Patent

CA 2415531

A power mine door installation utilizing compressed air from the compressed air system available in the mine as the power source for a hydraulic door-operating mechanism.

Kennedy John M.

E - Fixed Constructions – 21 – D
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Kennedy William R.

E - Fixed Constructions – 21 – D
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Jack Kennedy Metal Products & Buildings Inc.

E - Fixed Constructions – 21 – F
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Smart & Biggar

G - Physics – 01 – V
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