FR427939A - Dual acoustics for aviators - Google Patents
Dual acoustics for aviatorsInfo
- Publication number
- FR427939A FR427939A FR427939DA FR427939A FR 427939 A FR427939 A FR 427939A FR 427939D A FR427939D A FR 427939DA FR 427939 A FR427939 A FR 427939A
- Authority
- FR
- France
- Prior art keywords
- aviators
- acoustics
- dual
- dual acoustics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/30—Mounting radio sets or communication systems
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR427939T | 1911-03-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR427939A true FR427939A (en) | 1911-08-17 |
Family
ID=1470371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR427939D Expired FR427939A (en) | 1911-03-29 | 1911-03-29 | Dual acoustics for aviators |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR427939A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090042A (en) * | 1975-03-24 | 1978-05-16 | Kayce, Inc. | Acoustical communications headset |
US4473130A (en) * | 1981-10-12 | 1984-09-25 | Hauni-Werke Korber & Co. Kg. | Crash helmet with communication system |
US4505358A (en) * | 1982-01-11 | 1985-03-19 | Ulrich Sielaff | Voice communicator |
-
1911
- 1911-03-29 FR FR427939D patent/FR427939A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090042A (en) * | 1975-03-24 | 1978-05-16 | Kayce, Inc. | Acoustical communications headset |
US4473130A (en) * | 1981-10-12 | 1984-09-25 | Hauni-Werke Korber & Co. Kg. | Crash helmet with communication system |
US4505358A (en) * | 1982-01-11 | 1985-03-19 | Ulrich Sielaff | Voice communicator |
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