AUTOMATIC CALL BOX No. 442
Automatic call box of cast iron, to be used in connection with all ordinary telephone instrument.
The way of using this instrument is the same as in the case of the 441, but instead of the buzzer a vibrating spring is used, which makes and breaks a contact and thus gives a signal when a coin is put in.
Here also precautions are taken against frauds, and this class of instrument can be used for coins of any size.
Weight 7.00 lbs.
Price £1 1 0s.
Taken from the Ericsson Telephone Catalogue 1903
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