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Caption: December 13, 1948 - NERVE CENTER -- A giant control board, registering the operations inl vital parts of the slag fuming plaMT at the Upper Valley smelter, provides the key to the plant drawing zinc oxide from the slag heaps. Where a moment's carelessness could shut down the entire plant, much of the responsibility for its performance rests with the man on duty at the control room.
Album ID: 453964
Photo ID: 17928874
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