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Lamp controlgear. Part 2-2. Particular requirements for d.c. or a.c. supplied electronic step-down convertors for filament lamps
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Stop valves for thermal power-stations. Types and main parameters
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Alternating current apparatus and devices for voltages above 1000 V. Temperature rise at continuous duty. Norms and test methods
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Sealed radionuclide gamma-radiation sources. Methods of parameters measurement
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Shield box viewing windows. Types, construction and dimensions
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Electric lamps and starters. General requirements for export
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