From 1921 on Edward E.Rosen produced Headphones and Loudspeakers, branded Ultra. In 1925 the Company Ultra was formed. In 1960 the name was changed to: Ultra Radio and Television Ltd., based at Eastcote, Ruislip, Middlesex, GB.
Ref.:
-Hill: RadioRadio, p.239 -Geddes/Bussey: The Setmakers, p.44 et al
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