McVitie Weston valve collection, STC valve, type 5B/251M
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STC valve, type 5B/251M, mica spacer marked LVM 16 DF
Science Museum Group
© The Board of Trustees of the Science Museum
STC valve, type 5B/251M, mica spacer marked LVM 16 DF, (RMW/Y515 - McVitie Weston number), by Standard Telephones and Cables Limited.
