Main Switch Board - Front View, Rear View & Wiring Diagram - Steel Diagram for J.P. MORGAN Jr (1910)
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Main Switch Board - Front View, Rear View & Wiring Diagram - Steel Diagram for J.P. MORGAN Jr (1910)


A plan for J.P. MORGAN Jr detailing main switchboard - front view, rearview & wiring diagram - steel diagram drawn by R. Johanson for the Great Lakes Engineering Works in 1944.