ATM SWITCHBOARDS T.286 & T.287
|MINE TELEPHONES AND SIGNALLING APPARATUS
Fitted with common line and supervisory indicators, 120 ohms resistance, and associated jacks. Plugs and cords are furnished in pairs, together with an operatorís plug and cord.
Terminals provide for the connection of a night-bell or audible alarm circuit, actuated by the fall of an indicator shutter.
The case is hinged to the backboard, and can be swung forward, affording ready access to indicators, jacks, wiring and terminals.
T.286 for 5 lines - 2 Pairs, Plugs and Cords.
Taken from the ATM Mine Telephones and Signalling Apparatus Catalogue 1928
Last revised: October 06, 2012