The portable wire recorder Mezon was produced presumably from 1960 (I think that later) to 1987 for special services and the Ministry of Internal Affairs. Dimensions of the device 158x75x26 mm. Weight without power 500 g. The wire on the coil lasts for 1.5 hours of recording. The dimensions of the coil 35x12 mm. Rewind time 1 hour. 7 V power supply from the battery "BOR", OP-2K elements (RTs-63), DEAC batteries or 5 Saturn cells placed in an external container. Power can be supplied from an external source through an adapter that plugs into the battery compartment. Recording is carried out with a microphone "Neva" or "T-65", headset TM-2, or from the adapter. Listening to the recording is done with a TM-2 earphone or external ULF. To connect a microphone, earphone and adapter has a connector labeled "M". The other two connectors are for the remote control switch. The plugs are threaded to prevent accidental slipping out. The recorder is controlled by a switch, which when not in use is in the "Stop" position, marked on the housing cover with a blue circle. When the switch is switched to the position marked with a red circle, and with the top cover closed, recording is performed, and when open, playback is performed. The rewind of the wire is carried out with the lid open and the switch is turned clockwise until it stops. The circuit is assembled on five transistors. To reduce interference, the amplifier unit is placed in a permalloy screen. The connectors, the motor control circuit and the bias generator are assembled on the board located at the end of the case. To control the volume and recording, there is an attenuator in 3 positions. There is no erasing head; erasing is performed by an external demagnetizing throttle. Passik transmits movement from the engine to the horizontal flywheel, which in turn rotates one of the two rubberized faceplates, depending on the mode of operation. The universal head moves up and down with the help of a worm gear. There is a hitchhiking, triggered when the wire ends on the supply coil.At the same time, a spring-loaded lever released by the turns of wire is released on the supply coil and presses the hitch-hitch lever located under the supply coil. The latter opens the contacts of the motor circuit. The kit has the necessary set of accessories, such as additional coils, including wires, power adapter, external recording adapter, adapter for contactless recording from the telephone line, degauss choke, battery "BOR", cups of OR-2K elements (RC- 63), TM-2 earphone, lubricant tube, wire threading device.