1960s: drawing of soft coal pile going into coke oven, pipes marked "waste gases" and "liquids" let out smoke and liquid, water tank pours water on carts on tracks going by, cart dumps coke onto pile
1960s: drawing of soft coal pile going into coke oven, pipes marked "waste gases" and "liquids" let out smoke and liquid, water tank pours water on carts on tracks going by, cart dumps coke onto pile