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13. Conveyor Belt Mechanism Inside a Coal Mine

IDNO:
033551
Title:
Conveyor Belt Mechanism Inside a Coal Mine

14. Conveyor Belt Mechanism Inside a Coal Mine

IDNO:
033552
Title:
Conveyor Belt Mechanism Inside a Coal Mine

15. Coal on a Conveyor Belt Inside a Mine

IDNO:
033553
Title:
Coal on a Conveyor Belt Inside a Mine