SINGLE LINE SECRET CONVERSATION INTERPHOHES
No. U 453
Automatic Single Line Secret Conversation Interphone. Wall Pattern. (Radial Switch Type), comprising: Standard pattern Hand Combination, Automatic Switch Cradle, Induction Coil, Call bell, Combined Ringing Key and Automatic Cut-in and Cut-out Device, "Perfecta" step-by-step Radial Line Selector.
Metal parts are Nickel-plated and Woodwork Solid Walnut, with Hinged backboard.
No. U 454
Table Telephone, comprising: same parts as No. U 453, but with Buzzer instead of bell and with the addition of Multiple Flexible Cord and Wall Rosette.
Available in 10, 20 or 30 lines.
Taken from the Sterling Catalogue No. 11 & 12
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