McVitie Weston valve collection, STC valve, type 4102D
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LicenseSTC valve, type 4102D, (RMW/D97B - McVitie Weston number)
Science Museum Group
© The Board of Trustees of the Science Museum
STC valve, type 4102D, (RMW/D97B - McVitie Weston number), by Standard Telephones and Cables Limited.
