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A platform for research: civil engineering, architecture and urbanism
Red electric warning lanterns
Standard covers requirements and methods for construction, vibration and shock, weatherproof, dust, reliability and life, and photometric tests of red electric warning lanterns. (5¢)
Red electric warning lanterns
Standard covers requirements and methods for construction, vibration and shock, weatherproof, dust, reliability and life, and photometric tests of red electric warning lanterns. (5¢)
Red electric warning lanterns
U S Nat Bur Standards -- Commercial Standard
1940
11 pages
Standard
English
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