Railway Signal Engineer. Vol. 9, No. 12. December 1916. Advertising section, p. 27. (Chicago: Simmons-Boardman Publishing Co.)
Author
Hall Switch & Signal Co.
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=={{int:filedesc}}== {{Information |Description={{en|1=Advertisement for {{w|Hall Signal Company|Hall Switch and Signal Company}}, USA. The ad features a photo of a {{w|Wigwag (railroad)|"wigwag" signal}} installed at a railroad {{w|grade crossing}} (l...