4. B - Operations, Transporting
  5. 01
  6. D

Air filter

B - Operations – Transporting – 01 – D

Patent

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Details

183/109

B01D 46/52 (2006.01) B01D 39/16 (2006.01)

Patent

CA 971487

Olsen Sydney A.

F - Mech Eng,Light,Heat,Weapons – 02 – C
Inventor

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Potter Jimmie C.

B - Operations – Transporting – 01 – D
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Wood Charles D. (iii)

C - Chemistry – Metallurgy – 23 – C
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Deere And Company

A - Human Necessities – 01 – D
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