General purpose receivers for ground and vehicle stations used in conjuntion radio transmitter WS 76. The reception set R-109 is an eight-valve superheterodyne, designed for R.T. or C.W. reception. The wireless set, a loudspeaker and vibrator power-pack are built in one metal case, which also contains a set of spare valves and spare vibrator'. No idea about the spare valves and vibrator - again, I've never even opened it so hopefully they're still there...