McVitie Weston valve collection, STC Micromesh valve, type PA1
- Made:
- circa 1930
STC Micromesh valve, type PA1, (RMW/Y364A - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.
STC Micromesh valve, type PA1, (RMW/Y364A - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.