Cossor valve, type M.41.P, top cap for heater and 4-pin base, green printed label, (RMW/F40 - McVitie Weston number), by A C Cossor Limited, 1927.
Cossor valve, type M.41.P, top cap for heater and 4-pin base, green printed label, (RMW/F40 - McVitie Weston number), by A C Cossor Limited, 1927.