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Hickok(31)B&K(8)Triplet(7)Heathkit(6)Avo(5)Weston(5)Eico(4)Western Electric(4)Mercury(3)Precision(3)Sencore(3)Emc(2)Knight(2)Metrix(2)Neuberger(2)RCA(2)RD Instruments(2)Shell(2)Simpson(2)Superior(2)Supreme(2)Accurate(1)Boes(1)C.B.S. Columbia(1)Commercial Trades Institutes(1)Conar(1)Elektromess Dresden(1)Elpo(1)Espey(1)Forway(1)Jackson(1)Jetronic Industries(1)Lafayette(1)Longhin(1)Mullard(1)National Schools(1)Nri(1)Precise(1)Sovnarhoz(1)Sylvania(1)Taylor(1)Telefunken(1)Tesla(1)Triplet 3414(1)Wester Electric(1)Westmore(1)

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