- University of Illinois at Urbana-Champaign, University Library
Caption: "Hall Signal Co." From text: "The Hall Signal Co. of 50 Broadway, New York, and 340 The Rookery, Chicago, are manufacturers of all kinds of Electric and Mechanical Signaling apparatus for railroads. The Hall Automatic Electric Block Signal System is in operation on twenty-one of the leading railroads of this country. On the opposite page is shown an application of the Hall highway crossing alarm bell at S. Union street, Chicago.
- Chicago , IL
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