High voltage subscriber line interface circuit
High voltage switch and capacitive drive
High-speed relaying system
Higher speed digital loop carrier transmission system
Hinge apparatus having a self-latching hinge shaft for...
Hold bridge circuit
Hold circuit for multi-line key telephone system
Hold circuit for telephone
Hold circuit for telephone system
Hold control for a key telephone system
Hold detecting and control circuit for a key telephone system
Holding party call back subscriber feature
Home agent call center system and method
Home appliance and home appliance system
Home communications and control system
Home services delivery system with intelligent terminal...
Home telephone exchange
Hook flash signal actuated telephone control device
Hook switch actuator assembly
Hook switch for a telephone instrument of single body type