The change from manual to dial operation in the telephone industry / by Ethel L. Best.
|Main Author:||Best, Ethel L.|
Washington : U.S. G.P.O., 1933.
Telephone operators > Effect of technological innovations on > United States.
Women > Employment > United States.
At head of title: United States Dept. of Labor, Women's Bureau.
iii, 15 p. ;
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