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The radio designer "Intercom" (M) was supposedly produced since 1981 by the Kuznetsk Plant of Instruments and Capacitors, mountains.
Penza
The radio designer allows you to assemble an intercom unit consisting of two identical devices for wired communication between subscribers at a distance of up to 100 m. The intercom unit is modernized with the letter "M".
On the cases of PU there is an inscription "Electronics", although nowhere else is it mentioned.
The design of the intercom "M" differs from the previous one, the circuit is the same, but transferred to silicon transistors.