"Pye 'Ranger' VHF radio telephone set, c 1960s."

Sectioned view of telephone with handset, c 1960.

Wall telephone using a Blake transmitter, c 1880s.

SWB1 short-wave radio transmitter no 7, 1927.

Ferranti television receiver, c 1930s.

Ferranti television receiver, c 1930s.

Plastic, metal and paper, late 20th century.

Earth station klystron amplifier, c 1980.

Three Casio digital watches, 1990s.

Three Casio digital watches, 1990s.

Multi-function Casio digital quartz wristwatch, 1998.

Charles Thomson Rees Wilson, Scottish physicist, c 1920s.