Title:
HEARING AID VENT TUBE
United States Patent 3470328
US Patent References:
Earphone
- - 2325590
Loudspeaker magnetic field structure
- - 2964597
/3126977.html
- - 3126977
Hearing aid
- - 3170046
Earphone
- - 2325590
Loudspeaker magnetic field structure
- - 2964597
/3126977.html
- - 3126977
Hearing aid
- - 3170046
Inventors:
Daniels, William Lee
Publication Date:
09/30/1969
View Patent Images:
Export Citation:
Assignee:
GOLDENTONE ELECTRONICS INC
Primary Class:
Other Classes:
381/328
International Classes:
H04R25/00; H04R25/00