Safety rules for radio installations : comprising part 5 of the 5th ed., National Electrical Safety Code. - United States. National Bureau of Standards (Washington : U.S. Govt. Print. Off, 1939)
At head of title: U. S. Department of Commerce. Harry L. Hopkins, secretary. National Bureau of Standards. Lyman J. Briggs, director.
Issued December 1, 1939.
<Supersedes H9>
Mode of access: Internet.
Keywords: Radio