4. C - Chemistry, Metallurgy
  5. 11
  6. B

Oil recovery

C - Chemistry – Metallurgy – 11 – B

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202/67, 260/499.

C11B 7/00 (2006.01) B01D 3/40 (2006.01)

Patent

CA 280510

Harding Clarke T.

C - Chemistry – Metallurgy – 11 – B
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Whetzel Joshua C.

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Na

G - Physics – 21 – G
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The American Sheet And Tin Plate Company

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