McVitie Weston valve collection, STC Micromesh valve, type 9.A.1
- Made:
- circa 1930
STC Micromesh valve, type 9.A.1, domed, (RMW/Y316A - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.
STC Micromesh valve, type 9.A.1, domed, (RMW/Y316A - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.