Vol. 29, no. 8-37, no. 7 (Aug., 1937-July, 1944) include the section: Aviation.For the hand operated switches, a pipe framework supports vertical metal guides which carry the oil switch operating mechanism and slate base forming a section of the switchboard panel. ... at Gatun, Pedro Miguel and Mirafiores locks; Three 2, 200-220-110 volt. transformer stations for the control boards at the locks; Stations at Cristobal and Balboa for coal handling plants, machine shops and dry docks.
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