Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 148
d 100 milliondoll.ars for this purpose. The cost of imechanical electric bells at crossingsrun from J600 to J900 each—whilegates require an attendant on duty atall hours. This latest patent gives promise ofsolving the problem. Signals are need-ed, and a signal that is at once inex-pensive, both as… … San Francisco, Cal., August 14, 1918 Telephone Dongia. 2372
Architecture · Building · Construction industry · Engineering
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