GRS Direct Current Signal Appliances Catalog

GRS Direct Current Signal Appliances Catalog (image 1/3)
GRS Direct Current Signal Appliances Catalog (image 2/3)
GRS Direct Current Signal Appliances Catalog (image 3/3)
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Direct Current Electric Signal Appliances Vol. 1 catalog by the General Railway Signal Company. 1916. This is a rare book, 7" x 9" x 2" thick, containing descriptions, ordering information and drawings of various GRS products such as: Direct current neutral and polarized relays, DC tower indicators, switch indicators, bases, supports, relay cases, electric interlocking machines, levers and lever guides, semaphore signals, switch machines, power derails, track layouts, swith circuit controllers etc. At least 500 pages. The book is in worn condition but the information inside is invaluable.
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