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

1. Main Control Panel for Modern High Capacity Preparation Plant

Coal is moving along a slope conveyor belt.

2. Slope Conveyor Belt at Williams 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