File:The Bell System Technical Journal, Volume 1, Fig. 9.png

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English: The Bell System Technical Journal, Volume 1, Fig. 9
Date
Source https://en.wikisource.org/wiki/Index:The_Bell_System_Technical_Journal,_Volume_1,_1922.pdf
Author Editor R. W. King

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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, 1929.

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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:The_Bell_System_Technical_Journal,_Volume_1,_Fig._9.png

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Fig. 9.

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