STERLING PRIMAX SYSTEM OF AUTOMATIC INTERPHONES
THE NEW “ERA”
These new patterns take the place of, and are an improvement on our "ERA" Automatic Interphones.
No. U 440
The New "Era" Automatic Interphone. Wall Pattern, Comprising: Standard pattern Hand Combination (No. U 575), Automatic Switch Cradle, Induction Coil, Call bell, Combined Ringing Key and Self Replacing Line Selector, each Lever fitted with a Silver Spring which ensures a strong rubbing contact.
Woodwork Solid Walnut.
No. U 442
Table Telephone, comprising: same parts as No. U 440, but with Buzzer instead of bell and with the addition of Multiple Flexible Cord and Wall Rosette.
Available in 5, 10, 16, 20 or 30 lines.
Taken from the Sterling Catalogue No. 11 & 12
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