NATIONAL TELEPHONE COMPANY
Pattern No. B30
Comprises - Granular Carbon Transmitter fitted inside the case, Watch Receiver, Silk Cord, Automatic Switch-hook, Induction Coil, 2 Magnet Generator and Bell.
This small type of instrument will be found useful in positions where the question of space is a consideration.
The batteries are fitted away from the instrument, which can be provided with Lightning Arresters at a small extra charge.
Taken from the 1903 Catalogue.
Last revised: July 03, 2020