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• 09:36, 2 July 2025 ChrisVG talk contribs created page Patent for Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems (Q38982) (wbeditentity-create:2|en: Patent for Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems, patent for stereo concept and sterio (record) recording)