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IEC Servicemaster was a major distributor and rebrander of valves in the USA. They where based in New York and bought valves from RCA, Sylvania and General electric. These valves were marked with their own names such as IEC-Mullard, IEC-Servicemaster, ICC-Servicemaster, El Menco. In the mid-1950s IEC signed an import agreement with Mullard of Great Britain that also licensed IEC to use the Mullard name in the US. This company were the sole distributors of Mullard valves in the USA.
Information courtesy of Watford Valves.
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