Is: 1885 (Part Iv/Sec 1) - 1973; Electrotechnical Vocabulary Part 4 Electron Tubes Section 1 Common
Indian Standards Institution
Is: 1885 (Part Iv/Sec 1) - 1973; Electrotechnical Vocabulary Part 4 Electron Tubes Section 1 Common - BIS 1974
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Is: 1885 (Part Iv/Sec 1) - 1973; Electrotechnical Vocabulary Part 4 Electron Tubes Section 1 Common - BIS 1974
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