| Sterling Interphones
STERLING "PRIMAX" SYSTEM OF AUTOMATIC INTERPHONES
(RADIAL SWITCH TYPE)
(Regd. Nos. 499,444 and 538,687)
ADVANTAGES
- Cross talk is reduced to a minimum.
- All instruments are fitted with Self-Replacement Device.
- When conversation is finished the act of replacing the handset automatically disconnects the switch.
- It is only necessary to move the Line Selector when making a call.
- Calls may be received and answered irrespective of time position of the Line Selector.
- It is impossible to inadvertently make contact with more than one line at a time.
ALL LOCAL BATTERIES ARE ENTIRELY DISPENSED WITH
No. U 410
Automatic Interphone, Wall Pattern (Radial Switch Type) with Revolving Granular Carbon Transmitter, Induction Coil, Double Pole
Watch Receiver, Call Bell, Automatic Switch Hook, "Perfecta" step-by-step Radial Line Selector, Automatic Cut-in and
Cut-out Device, Ringing Key.
The metal parts are Nickel-plated and Woodwork is solid Walnut.
Available in 5, 10, 15 or 20 lines. (Over 20 line models made to order)
Taken from the Sterling Catalogue No. 11 & 12
See also GEC K7867
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