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The block system of signaling on American railroads : the methods and appliances used in manual and automatic block signaling : also descriptions of hand-operated and power operated interlocking machines
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Edison primary batteries formerly known as Edison-Lalande : for stationary and portable gas engines, slot machines, fan motors, railroad and mine signals, phonographs, sewing machines, x-ray outfits, electro-medical use, telephone, fire and burglar alarm systems, and all other classes of work
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