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== External links == * [https://patents.google.com/patent/US3735939 Sony U.S. patent for U-matic videotape cassette], filed 1971. * [https://patents.google.com/patent/USD227579 Sony U.S. patent for design of U-matic deck], filed 1971. *[https://cool.culturalheritage.org/videopreservation/museum/ Video Preservation Equipment Museum] * ''The History of Television, 1942 to 2000'', by Albert Abramson, page 93. *[https://www.experimentaltvcenter.org/vhp/ampex-products-chronology Ampex page] in the [[Experimental Television Center|Experimental TV Center]] {{Homevid|state=collapsed}} [[Category:Audiovisual introductions in 1953]] [[Category:Film and video technology]] [[Category:Japanese inventions]] [[Category:Tape recording]]
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