. The Bell System technical journal . ^ inches with 100 lines per by courtesy of the Associated Press. .1 A7-:iI- TI:LI:PI10rUGRAPlI 565. Fig. 10—ielephotooraph. Received 10 by 1432 inches with 100 lines per by courtes>- of the Associated Press. 566 SYSTliM TJ-:CHNICAL JOURNAL

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1