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United States Patent | 3,562,451 |
Mullen, Jr. , et al. | February 9, 1971 |
An improved headset and microphone construction for use in aqueous environts of high ambient pressure and a method of manufacture thereof.
Inventors: | Mullen, Jr.; Walter W. (Panama City, FL), Kirkpatrick; Ollie G. (Panama City, FL) |
Assignee: |
THE United States of America as represented by the Secretary of the Navy
( |
Appl. No.: | 04/736,213 |
Filed: | June 11, 1968 |
Current U.S. Class: | 381/334 ; 367/160; 367/162; 367/165; 379/175; 381/190; 381/376; 381/378; 381/54 |
Current International Class: | H04M 1/05 (20060101); H04M 1/04 (20060101); H04r 017/00 () |
Field of Search: | 179/110.1,187 340/10,8 181/.5 310/8.5,8.6,9.1 |
2434143 | January 1948 | Chilowsky |
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3360664 | December 1967 | Straube |
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3218607 | November 1965 | Brock et al. |
3387149 | June 1968 | Young |