System for improved reproduction of sound
United States Patent 3378098
US Patent References:
Acoustic transformer
- - 1730528

Acoustic transformer
- - 1730532

Loudspeaker
- - 2115129

Louid speaker
- - 2797766

Loudspeaker
- - 3027964


Inventors:
Eiseman Jr., Bernhardt Joseph
Publication Date:
04/16/1968
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Assignee:
Pont DU.
Primary Class:
181/148
Other Classes:
181/160
International Classes:
H04R1/28
US Patent References:
3302748Loudspeaker system