McVitie Weston valve collection, STC valve, type CV53
STC valve, type CV53, inserted as V.1 in a 2-valve unit with associated circuitry, marked 17-LU-27D. Ser. No. 171, (RMW/Y741 - McVitie Weston number), by Standard Telephones and Cables Limited.
STC valve, type CV53, inserted as V.1 in a 2-valve unit with associated circuitry, marked 17-LU-27D. Ser. No. 171, (RMW/Y741 - McVitie Weston number), by Standard Telephones and Cables Limited.