STERLING TELEPHONE AND ELECTRIC Co. Ltd
SINGLE LINE SECRET CONVERSATION INTERPHONES
No. U 453
Automatic Single Line Secret Conversation Interphone. Wall Pattern. (Radial Switch Type), comprising:
Metal parts are Nickel-plated and Woodwork Solid Walnut, with Hinged backboard.
No. U 454
Table Telephone, comprising:
Available in 10, 20 or 30 lines.
Taken from the Sterling Catalogue No. 11 & 12
Last revised: April 28, 2021