BT TONECALLER No. 16
British Telecom Tone caller No.16 - High impedance tone caller with 3 Metre cord for use on PST, (alternatively can be hard wired to screw terminals), incorporates (user accessible) volume control and switches to give four combinations of pitch and cadence of tone, available on sale or rental terms.

Made by Hosiden Besson Ltd.
 
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Last revised: October 30, 2022

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