Brinton, Willard Cope, 1880- · New York, The Engineering magazine company · leaf 342
325 GENERAL METHODS … Courtesy of the Tabulating Machine Com-pany Fig. 231. A Completely Equipped Office for Collecting and Tabulating the Operating and Sales Statistics of an Electric-Lighting Company The girls at the left are operating the key punches for punching the cards. A gang punch is shown on the table at the…
Graphic methods · Statistics
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