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HELIOS 68
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== Example of Katedra/Zakład Fototechniki's cooperation with the industry in the 1960s ==
The letter of February 1968 from the Silesian Factory of Incandescent Lamps HELIOS [Śląska Fabryka Lamp Żarowych HELIOS] is an order to test the performance of prototype colored bulbs to be used as a photographic darkroom safelight.
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