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B.

Mechanical B
Mechanical B. 1 schematicMechanical B. 2 scraper_beltMechanical B. 3 scraper_belt2Mechanical B. 4 skirtingMechanical B. 5 stamplerMechanical B. 6 tail_endMechanical B. 7 take_upMechanical B. 8 vploughtMechanical B. 9 weigher