COIN COLLECTING APPARATUS

摘要

A coin collecting box for insertion between a telephone instrument (1) and a line (2,2 min ) to a telephone exchange includes a validator (7) and a dial pulse detector (9) which provide respective signals to a control circuit (8) which may be a microprocessor. The control circuit (8) determines from signals on the line from the telephone (1) whether the call is permitted. If the call is not permitted the control (8) causes a switch (5) to interrupt the connection to the line (2). A key operated switch (15) provides signals to the control circuit (8) which cause that circuit to permit any calls from the associated telephone (1).