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Coal is moving along a slope conveyor belt.

1. Slope Conveyor Belt at Williams Preparation Plant

Mine worker examining main control panel, Williams, May 15, 1953.

2. Main Control Panel for Modern High Capacity Preparation Plant

5 x 3/8 inch raw coal is flowing into a chance cone system

3. Washing Coal with the Chance Cone System, Williams Preparation Plant, Pittsburgh Consolidation Coal Company