McVitie Weston valve collection, STC valve, type 4019-B
- Made:
- 1936
STC valve, type 4019-B, pinch marked LF 5133, glass marked No.31, (RMW/E163 - McVitie Weston number), by Standard Telephones and Cables Limited, 1936.
STC valve, type 4019-B, pinch marked LF 5133, glass marked No.31, (RMW/E163 - McVitie Weston number), by Standard Telephones and Cables Limited, 1936.