DE311911C - - Google Patents
Info
- Publication number
- DE311911C DE311911C DENDAT311911D DE311911DA DE311911C DE 311911 C DE311911 C DE 311911C DE NDAT311911 D DENDAT311911 D DE NDAT311911D DE 311911D A DE311911D A DE 311911DA DE 311911 C DE311911 C DE 311911C
- Authority
- DE
- Germany
- Prior art keywords
- mouthpiece
- speaking
- openings
- air
- outlet openings
- 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.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Duct Arrangements (AREA)
- Air-Flow Control Members (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE311912T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE311911C true DE311911C (OSRAM) |
Family
ID=32332143
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT311911D Active DE311911C (OSRAM) | |||
| DENDAT311912D Active DE311912C (OSRAM) |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT311912D Active DE311912C (OSRAM) |
Country Status (1)
| Country | Link |
|---|---|
| DE (2) | DE311912C (OSRAM) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505358A (en) * | 1982-01-11 | 1985-03-19 | Ulrich Sielaff | Voice communicator |
-
0
- DE DENDAT311911D patent/DE311911C/de active Active
- DE DENDAT311912D patent/DE311912C/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE311912C (OSRAM) |
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