Telephone set comprising a line voltage stabilizer having a DC s
Telephone set having a volatile memory
Telephone set usable as an acoustic coupler
Telephone set with background noise suppression function
Telephone set with circuit for suppression of howling and echo
Telephone subscriber system incorporating a drive interface for
Telephone system with automatic volume control
Telephone terminal having multiple handsets
Terminal apparatus having a function for preventing unnecessary
Terminal apparatus with a handset using a four pin connector