File:Carrier growth 1928.png

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Summary

Description
English: Growth of carrier telephony in the Bell system
Date
Source doi 10.1109/T-AIEE.1928.5055151 page 1361 https://ieeexplore.ieee.org/document/5055151
Author H. A. Affel

Licensing

Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Carrier_growth_1928.png
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Carrier_growth_1928.png
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Captions

Growth of carrier telephony in the Bell system

Items portrayed in this file

depicts

inception

1928

October 1928Gregorian

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current11:35, 29 April 2026Thumbnail for version as of 11:35, 29 April 20262,328 × 1,867 (115 KB)imagescommonswiki>WhaleFarmUploaded a work by H. A. Affel from https://ieeexplore.ieee.org/document/5055151 with UploadWizard

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