Sectioned desk telephone transmitter and receiver, 1926.

Reis telephone, 1863.

Reis telephone, 1863.

Reis telephone, 1863.

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

Pneumatic dispatch tube switch, early 20th century.

Pneumatic dispatch tube switch, early 20th century.

Time Switch, type WTIY no. 1271611, and cas

White china switch, 1908.

Rabbit telepoint telephone by Hutchison Personal Communications Ltd, 1993.

Rabbit telepoint telephone by Hutchison Personal Communications Ltd, 1993.

Laying telephone cables, London, 5 November 1937.