Cossor Braun Tube valve, glass tube 1in diam with bulbous end 3.5in diam, internally silvered, 1ft 11in long overall, (RMW/K18 - McVitie Weston number), by A C Cossor Limited, 1903.
Cossor Braun Tube valve, glass tube 1in diam with bulbous end 3.5in diam, internally silvered, 1ft 11in long overall, (RMW/K18 - McVitie Weston number), by A C Cossor Limited, 1903.