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keypad diode matrix

Abstract: telephone handset circuit schematic diagram RM9910
Contextual Info: REPERTORY DIALLER Rfl 9910 The repertory dialler, RM 9 910 is a u- pr oc es sor , progr am me d to perform as a pulse dialler, DTMF controller and di sp la y driver in a mu l t i p u r p o s e t e l ep hon e set. The RM 9 910 has redial and save registers of 32 digit