Controlling method and apparatus of constant-frequency sound-production of electrical horn

Application number :: 85279
Application type :: Standard
Application status :: LAPSED
Under opposition :: No
Proceeding type :
Invention title :: Controlling method and apparatus of constant-frequency sound-production of electrical horn
Inventor :: Wan, Yu
Agent name :
Address for service :
Filing date :: 28 July 1998
Associated companies :
Applicant name :: Wan, Yu
Applicant address :
Old name :
Original Source :: Go

Controlling method and apparatus of constant-frequency sound-production of electrical horn A Standard patent application filed on 28 July 1998 credited to Wan, Yu