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1944 - doors open automatically as you approach them through an invention welcomed by the baggage carrying public

DOOR-OPENING MECHANISM

E&MP 94.002

Photo Electric Cells

November 5, 1944

Doors of railroad stations and departments stores may in future open automatically as you approach them through an invention welcomed by the baggage carrying public.

As you walk toward the door you interrupt a beam of light shining on a photoelectric cell and this sets the door-opening mechanism in operation.

Original Caption by Science Service



National Museum of American History

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