4. E - Fixed Constructions
  5. 04
  6. B

Floor or roof slab

E - Fixed Constructions – 04 – B

Patent

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72/38

E04B 5/06 (2006.01)

Patent

CA 336931

Heeren Arthur A.

E - Fixed Constructions – 04 – B
Inventor

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Johnson Ernest B.

G - Physics – 11 – B
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G - Physics – 21 – G
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The Canadian Gypsum Company Limited

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