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US. Patent Sep.19,1989 Sheet 3 of 7 4,868,865 GENERATE RING TONE 4b OFF-HOOK 9. YES 4d NO 4C IS TIME PERIOD T2 ELAPSED '? STOP I GENERATING OF RINGTONE CONNECT STOP TELEPHONE I TRANSMITTING TO LINE 4e OF RBT. RECEPTION cONNEcT 4g 4i“ FAcsIMILE TO LINE AUTOMATIC FACSIMILE -REcEIvING OPERATION FIG.2B Q ~4h
