New Use for Photocell
[THE photocell is being incorporated in the electric elevator with remarkable success. Exact levelling is ensured, and a beam of light across the door makes it impossible to close the door or start the lift when a passenger is entering or leaving.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19330428.2.40
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Radio Record, Volume VI, Issue 42, 28 April 1933, Page 23
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46New Use for Photocell Radio Record, Volume VI, Issue 42, 28 April 1933, Page 23
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