Permanent Dynamic Telephone

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As second independent means of communication a permanent-dynamic (sound-powered) telephone system is installed making conversation between pneumatic control station and chamber compartments possible without depending on external current supply.

The telephone handsets of pneumatic station, MC and AC are connected via a twin-core main.
Calling is done by vigorous turning of the howler generator situated below the microphone on each telephone handset.

An additional source of energy is not necessary.
The telephone is constantly ready for operation and maintenance-free.