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Boxes used by equipment manufacturers for spares etc. for their products. The valves in these boxes are very often made by BVA members, many come from associated companies within the same group. They may retain the original manufacturers markings or may be re-marked with the trade name of the O.E.M. Cossor, Ferranti and EverReady had all manufactured valves at one time but no longer did so by the time these boxes were issued.
