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of Euston Road, London, NW1.
of Vibrant Works, Treforest, Glamorgan.
WWII. During the war years they manufactured some fairly sensitive defence equipment for the British government.
1947 British Industries Fair Advert for "Yours in Harmony". Model D110/W and D111 Radios, and the Car Radio. Manufacturers of Radio Receivers, Car Radio Sets, Vibratorpacks. (Music and Radio Section - Olympia, Ground Floor, Stand No. C.1534) 
1953 Manufacturer of TV sets 
1956 Acquired R. M. Electric.
By 1958 was part of Francis Sumner (Holdings)