GB191204704A - - Google Patents
Info
- Publication number
- GB191204704A GB191204704A GBM4704DA GB191204704A GB 191204704 A GB191204704 A GB 191204704A GB M4704D A GBM4704D A GB M4704DA GB 191204704 A GB191204704 A GB 191204704A
- Authority
- GB
- United Kingdom
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US454809TA | 1912-02-28 | 1912-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB191204704A true GB191204704A (ko) |
Family
ID=8901180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBM4704D Active GB191204704A (ko) | 1912-02-28 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR454809A (ko) |
| GB (1) | GB191204704A (ko) |
-
0
- GB GBM4704D patent/GB191204704A/en active Active
-
1913
- 1913-02-26 FR FR454809A patent/FR454809A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR454809A (fr) | 1913-07-16 |