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One of the, many, rules of the BVA cartel forbade BVA members from marketing multiple valves. This rule was one of the factors behind MOV's foray into catkins. However, the lack of British-made multiple valves delayed the introduction of low-cost 'modern' British superhets and played into the hands of foreign competitors, so the rule was abandoned abruptly, and not without some acrimony, during the mid 1930s.
Because of their commitment to catkins MOV were a bit late in developing a range of multiple valves.
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