McVitie Weston valve collection, STC valve, type 5B/251M
- Made:
- 1953
STC valve, type 5B/251M, internal mica sheet marked LTJ 49 D, (RMW/Y290 - McVitie Weston number), by Standard Telephones and Cables Limited.-1953
STC valve, type 5B/251M, internal mica sheet marked LTJ 49 D, (RMW/Y290 - McVitie Weston number), by Standard Telephones and Cables Limited.-1953