Hertz wave receiver, double coil with needle armature and small indicating quadrant, with vulcanite square base, etc

Wireless telegraph trench receiver Mark III in a waterproof case, set No. 799, 1915

Gecophone loudspeaker in black vulcanite, early pattern horn type, by General Electric Co. Ltd, 1920s

Bell type telephone earpiece in vulcanite by the United Telephone Company

Sterling W/T transmitter for wireless telegraphy with parts by W.D. Wireless of Soho and W.R. Morris of Birmingham

Cabinet gramophone, the Special Cambridge model with E.M.G. soundbox and goose-neck tone-arm feeding to a Collier vulcanite internal horn, with Paillard motor and in a plain dark oak cabinet, by E.M.G., c. 1927

Telephone receiver of vulcanite, 1187

Press button used by King George V for opening buildings in Newfoundland in 1911 and unveiling the Cartier Monument, Montreal, Canada, from Balmoral, 1919, vulcanite, ivory and metal, 1910

Type segment from Hammond typewriter, a shuttle machine with keys arranged in 'ideal' positions by the inventor and not the standard arrangement, invented by J.B. Hammond, c. 1893