Структурные схемы систем связи и сигнализации АБК

Structural diagram of telephone communication and clockwork.
Structural diagram of operational telephone communication.
Structural diagram of two-way loud-speaking communication, control-search communication and wire broadcasting.
Structural scheme of radio communication.
Structural diagram of the video registration system of operations personnel.

The format is DWG, compatible with AutoCAD 2004-2017, Compass, ZWCAD, nanoCAD, BricsCAD, etc.