Skip to main content

 Telecommunications Object Thesaurus Term

Log in to add scope notes or new non-preferred terms.

key and lamp unit

key and lamp units

Initial Reference:
Vocabulary of Post Office Engineering Stores (1953)

Top term:

Scope notes:
Small key-based switching units for multi-line multi-telephone installations, such as a ticket office of travel agency. Two sizes allowed up to 10 or up to 20 network lines to be offered to as many or as few staff as the customer required. A wall mounted unit provided the necessary terminations and controls.


Click here to return to thesaurus home page

fun and games

Can you beat our games? Explode equipment to see what's inside, hear the changing sounds of telecommunications, see how telecommunications designs have changed over time or send an e-postacard.

what's on

The UK's first permanent gallery dedicated to the history of information and communication technologies opens in the new Information Age gallery at London’s Science Museum.

audio history

Take a trip down memory lane with extracts of the interviews which have been recorded as part of the Connected Earth oral history programme.

featured story

100 years of automatic switching!
In 1912 the GPO installed Britain's first automatic telephone exchange in Epsom.

Discover the early days of the telephone...