FR580652A - - Google Patents
Info
- Publication number
- FR580652A FR580652A FR580652DA FR580652A FR 580652 A FR580652 A FR 580652A FR 580652D A FR580652D A FR 580652DA FR 580652 A FR580652 A FR 580652A
- 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.)
- Expired
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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
- H04R13/02—Telephone receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR580652A true FR580652A (it) | 1924-11-13 |
Family
ID=1539558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR580652D Expired FR580652A (it) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR580652A (it) |
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0
- FR FR580652D patent/FR580652A/fr not_active Expired