Revision history of "File:Dimmer Patent Fortuny FR694028A Original document 20210307111703.pdf"

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  • curprev 11:21, 7 March 2021‎ ChrisVG talk contribs‎ 199 bytes +199‎ a patent for a dimmer system that keeps the colour temperature constant. source https://worldwide.espacenet.com/patent/search/family/000462145/publication/ DE199428C?q=FORTUNY%20MARIANO
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