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Mazda detector or AF triode valve, type AC/HL, C5 base Science Museum Group © The Board of Trustees of the Science Museum
Mazda detector or AF triode valve, type AC/HL, C5 base, base marked R.D.727059, five pin base with two short pins, (RMW/F28 - McVitie Weston number), by British Thomson-Houston Company Limited.