Explanations of the individual symbols are given at the top of the Box B itself.
Description of the Front panel from the left:
- speaker volume switch
- call button and light
- transmission control
- power switch and its indicator light
- headphone volume
Rear panel description from the left:
- handset connector
- speaker terminals
- light bulb
- grounding
- connector for connection to box A
- connector for connection to box A
73 - Petr, OK1RP
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