Name M´┐Żnzer 21 (Coin Telephone 21)
Maker DBP (Deutsche BundesPost / German Federal Post Office)
Date 1980

Public telephone box with push button selection for world-wide long-distance traffic.  The number procedure takes place with three denominations of money, which can be thrown in at will.  The money is counted electronically and indicated in the display digitally.  There also the approaching end of the discussion assets is indicated by an optical signal.  Remainders were now charged and returned quasi, since counting was to falling the different coins bound for no more.  These apparatuses did not change the coins, but they stored assets, which could be used or passed on for a further discussion.