DE221015C - - Google Patents
Info
- Publication number
- DE221015C DE221015C DENDAT221015D DE221015DA DE221015C DE 221015 C DE221015 C DE 221015C DE NDAT221015 D DENDAT221015 D DE NDAT221015D DE 221015D A DE221015D A DE 221015DA DE 221015 C DE221015 C DE 221015C
- Authority
- DE
- Germany
- Prior art keywords
- opening
- tube
- inner tube
- speaking
- outer tube
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Toys (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE221015C true DE221015C (cg-RX-API-DMAC10.html) |
Family
ID=482026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT221015D Active DE221015C (cg-RX-API-DMAC10.html) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE221015C (cg-RX-API-DMAC10.html) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542239B1 (en) | 1998-07-21 | 2003-04-01 | Institut Fur Chemo Und Biusensorik Munster E.V. | Method for testing the functionality of a spectrometer and a spectrometer comprising a fault recognition device |
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0
- DE DENDAT221015D patent/DE221015C/de active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542239B1 (en) | 1998-07-21 | 2003-04-01 | Institut Fur Chemo Und Biusensorik Munster E.V. | Method for testing the functionality of a spectrometer and a spectrometer comprising a fault recognition device |