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U.S. telephones and telephone calls, telephone censuses, 1902-1937

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yearcalls per phone per daytotal calls (millions)telephones in servicehouseholds with phone serviceBell phone sharebusiness phone shareCPI-urbannominal GDPreal GDPNotes:

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19374.7333,61819,453,40132%78.8%36%14.491.91,028.0Bell System composition clearer and more stable than other systems, and traffic reporting likely more accurate.

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19324.7230,04817,424,40631%79.2%36%13.758.7725.8Hence Bell System calls per phone likely better quality statistic than industry-wide statistic.

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19274.6831,61418,522,76737%74.1%35%17.495.5910.8

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19224.7124,64714,347,39533%66.3%not available16.873.4709.3Bell-controlled companies included with Bell System for 1917 and 1922.

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19175.1121,84511,716,520not available62.5%not available12.859.7631.7

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1912not availablenot available8,729,592not available58.3%not available9.437.4576.9Calls are calls originating with the system reporting.

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1907not availablenot available6,118,578not available51.2%not available9.133.9552.2

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1902not availablenot available2,371,044not available55.6%not available8.324.1468.2Calls reported are not exact: "they probably do not correctly represent any number

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more nearly exact than round billions for the country as a whole, or round millions or tens or

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changehundreds of millions for individual States." (Census, Telephones, 1922, p. 22)

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1927-321.0%-5.0%-5.9%-16.2%-21.4%-38.5%-20.3%

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Telephone traffic varies systematic by day.

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Bell System"a year's traffic is equivalent to 325 full days' traffic, due allowance being made for the decreased use of the

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yearcalls per phone per daytotal calls (millions)residence telephonesbusiness telephonesall telephonescentral offices / public exchangessystemstelephone on Sundays and holidays." (Census, Telephones, 1922, p. 22)

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19374.9427,6679,292,9176,039,06615,331,9836,94526

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19324.9825,0618,277,4695,515,76013,793,2296,77825Sources:

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19274.7323,6938,332,8145,393,24213,726,0566,11525

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19224.7716,567not reported9,514,8135,79626Census, Telephones, 1922, Table 22, p. 32

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19175.4614,598not reported7,326,8586,288145http://www2.census.gov/prod2/decennial/documents/13473055ch1.pdf

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19124.929,133not reported5,087,0275,853176

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19075.606,401not reported3,132,0635,418175Census, Telephones, 1937, Table 19, p. 29

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19026.393,074not reported1,317,1783,75344http://www2.census.gov/prod2/decennial/documents/19011043ch01.pdf

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changeConsumer Price Index (all urban consumers)

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1927-325.3%5.8%-0.7%2.3%0.5%10.8%0.0%ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt

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http://www.measuringworth.org/uscpi/

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Non-Bell companies with annual income of $10,000 or more ($5,000 or more for 1917 and 1912; exc. independent farmer and rural lines for 1907 and 1902)Gross domestic product

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yearcalls per phone per daytotal calls (millions)residence telephonesbusiness telephonesall telephonescentral offices / public exchangessystemshttp://www.measuringworth.org/usgdp/

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19374.875,2652,032,948926,2532,959,2015,594820

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19324.444,0391,779,812711,1902,491,0025,946893

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19275.055,5032,165,987820,4522,986,4395,3701,343

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19225.265,334not reported2,780,4214,8701,297

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19175.435,211not reported2,626,8526,0062,055

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19125.634,602not reported2,239,7215,8531,740

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19075.634,971not reported2,420,86610,1095,094

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19025.481,996not reported998,1196,6084,107

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change

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1927-32-12.0%-26.6%-17.8%-13.3%-16.6%10.7%-33.5%

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Non-Bell companies with annual income less than $10,000 (less than $5,000 for 1917 and 1912; independent farmer and rural for 1907 and 1902)

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yearcalls per phone per daytotal calls (millions)residence telephonesbusiness telephonesall telephonescentral offices / public exchangessystems

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19371.626861,051,762110,4551,162,2176,42849,714

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19322.289481,032,665107,5101,140,1756,50454,460

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19273.662,4181,629,816180,4561,810,2728,74258,780

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19223.672,746not reported2,052,1618,59455,930

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19173.162,036not reported1,762,8108,88151,034

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1912not reportednot reported1,402,8445,66230,241

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1907not reportednot reported565,649not reported17,702

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1902not reportednot reported55,747not reported4,985

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change

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1927-32-37.8%-60.8%-36.6%-40.4%-37.0%-25.6%-7.3%