A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
GPO installs automatic civil defense warning system
New electronic system provides Civil Defense warning signal for 6000 Government Printing Office employees; it consists of sirens powered by standard building electric service and electronically controlled by carrier current over existing program bell system.
GPO installs automatic civil defense warning system
New electronic system provides Civil Defense warning signal for 6000 Government Printing Office employees; it consists of sirens powered by standard building electric service and electronically controlled by carrier current over existing program bell system.
GPO installs automatic civil defense warning system
Elec Construction Maintenance
Willingmyre, D.W. (author)
1957
4 pages
Article (Journal)
English
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