. Telephones and Telegraphs and Municipal Electric Fire-Alarm and Police-Patrol Signaling Systems . I I LESS TH*N 40ED 40 TO 80K23 so TO 120 Y^k 20 AND OVER AVERAGE POPULATION PER TELEPHONE: 1902. AVERAGE NUMBER OF MESSAGES PER CAPITA:

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Keywords: ., bookcentury1900, bookdecade1910, bookidtelephoneste, bookyear1915