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

Phosphate mining

E - Fixed Constructions – 21 – B

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166/30

E21B 43/28 (2006.01)

Patent

CA 824960

Ralph C. Hughes

E - Fixed Constructions – 21 – B
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Richard L. Every

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Continental Oil Company

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G - Physics – 21 – G
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