FR7932E - - Google Patents
Info
- Publication number
- FR7932E FR7932E FR7932DA FR7932E FR 7932 E FR7932 E FR 7932E FR 7932D A FR7932D A FR 7932DA FR 7932 E FR7932 E FR 7932E
- Authority
- FR
- France
- 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/04—Supports for telephone transmitters or receivers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7932T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR7932E true FR7932E (fr) |
Family
ID=8618743
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7932D Active FR7932E (fr) | |||
| FR328528A Expired FR328528A (fr) | 1903-01-15 | Système de microphone pour appareils téléphoniques |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR328528A Expired FR328528A (fr) | 1903-01-15 | Système de microphone pour appareils téléphoniques |
Country Status (1)
| Country | Link |
|---|---|
| FR (2) | FR328528A (fr) |
-
0
- FR FR7932D patent/FR7932E/fr active Active
-
1903
- 1903-01-15 FR FR328528A patent/FR328528A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR328528A (fr) | 1903-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR328528A (fr) | Système de microphone pour appareils téléphoniques |