IS:01890 (part 6) - 1983/ISO 31 - 6 - 1980 (Reaffirmed 1989); Quantities, units and symbols Part 6 light and related electromagnetic radiations

IS:01890 (part 6) - 1983/ISO 31 - 6 - 1980 (Reaffirmed 1989); Quantities, units and symbols Part 6 light and related electromagnetic radiations - New Delhi BIS 1983 - 16p

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