Sharp Kabushiki Kaisha Corporation

Mitsuo Tsuda

Motohiko Hayashi

Masayuki Hachinoda

Masanori Morigami

A facsimile apparatus and a telephone set are connected to one telephone line in parallel with each other. A voltage variation .DELTA.V caused by closing and opening of a DC circuit of the telephone set is detected via an off-hook detector of the facsimile apparatus to establish the operation mode of the telephone set. The detected operation mode of the telephone set is stored in a RAM. The detected mode of the telephone set, and thus the closing and opening of the DC circuit of the telephone set, is displayed and/or printed.

Growing community of inventors

Yamatokoriyama, Japan

Mitsuo Tsuda