Russia Post released a stamp on Pavel M. Golubitsky, an outstanding Russian inventor in the field of telephony on 16th March 2020, depicting a telephone set along with his Portrait.
P. Golubitsky’s inventions are as follows: a dipole telephone, a multipolar telephone; a coal powder microphone, a microphone with a comb-like arrangement of coal; a power supply system of subscribers’ microphones with a common battery situated in the central station, which provided the means of building large urban telephone networks; and a telephone switch to interconnect pair-wise several telephone lines. P. Golubitsky was a pioneer of telephone service implementation on railway transport.
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