Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 172
expended 100 milliondollars for this purpose. The cost of mechanical electric bells at crossingsrun from $600 to $900 each—whilegates require an ajttendant on duty atall hourSi This latest pa,t6nt gives promise ofsolving the problem, eignals are need-ed, and a sigmal that is at once inex-pensive,… … Telephone Dongrlaa 2372 San Francisco, Cal., August 21, 1918 Eigtiee Pnbliotion Ofiice560 Mission Street eenth Year, No. 34
Architecture · Building · Construction industry · Engineering
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