230576. Baird, John Logie (1923, December 29)
Posted: Fri May 04, 2007 2:26 amThis is the patent for the Baird or lens disc, an improvement over the Nipkow or aperture disc.
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230576. Baird, John Logie (1923, December 29)
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Posted: Fri May 04, 2007 2:26 am