McVitie Weston valve collection, Tungsram valve, type SP4B
- Made:
- circa 1936
Tungsram valve, type SP4B, marked X9 447 and 8899, (RMW/Y226 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd., c. 1936.
Tungsram valve, type SP4B, marked X9 447 and 8899, (RMW/Y226 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd., c. 1936.