turning cylinder color changer (Q39061)

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Revision as of 09:52, 22 July 2025 by ChrisVG (talk | contribs) (‎Created claim: Property:P111: 1882)

first known color changer for electrical light

first known color changer for electrical light
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turning cylinder color changer
first known color changer for electrical light

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    First use date
    1882
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