. . "Safety rules for radio installations, comprising part 5 of the 5th ed., National Electrical Safety Code. <Supersedes H9> Issued December 1, 1939" . . . . "Safety rules for radio installations comprising part 5 of the 5th ed., National Electrical Safety Code. [Supersedes H9] Issued December 1, 1939"@en . . . . "National electrical safety code" . "National electrical safety code"@en . . . . .