4. C - Chemistry, Metallurgy
  5. 09
  6. K

Drilling

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

31/25, 255/25

C09K 8/035 (2006.01)

Patent

CA 970146

Sheldahl David B.

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Striegler John H.

E - Fixed Constructions – 21 – B
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Atlantic Richfield Company

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Na

G - Physics – 21 – G
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