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W. S. Gifford, Statistician, American Telephone & Telegraph Company
Fig. 194. Pin Map Showing the Location of Every Telephone Exchange Point in the United States in 1912. Only One Pin is Used for Towns Having Several Telephone Exchanges
The original map is 40 inches wide and 66 inches long. It contains 19,500 pins in five different colors showing the exact competitive condition in the telephone
service. This is probably the most elaborate pin map ever made
