1931 national electrical code, regulations of National Board of Fire Underwriters for electric wiring and apparatus as recommended by National Fire Protection Association. American Standard, approved Aug. 18, 1931
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1931 national electrical code, regulations of national board of fire underwriters for electric wiring and apparatus as recommended by national fire protection association. (American Standard, approved Aug. 18, 1931, by Am. Standards Assn., effective Nov. 1, 1931)
1931 national electrical code, regulations of National Board of Fire Underwriters for electric wiring and apparatus as recommended by National Fire Protection Association. American Standard, approved Aug. 18, 1931
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1931 National Electrical Code, Regulations National Board Fire Underwriters Electric Wiring Apparatus as Recommended by National Fire Protection Association