FR439904A - Appareil téléphonique simplifié - Google Patents
Appareil téléphonique simplifiéInfo
- Publication number
- FR439904A FR439904A FR439904A FR439904DA FR439904A FR 439904 A FR439904 A FR 439904A FR 439904 A FR439904 A FR 439904A FR 439904D A FR439904D A FR 439904DA FR 439904 A FR439904 A FR 439904A
- Authority
- FR
- France
- Prior art keywords
- telephone device
- simplified telephone
- simplified
- telephone
- 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.)
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR15735T |
Publications (1)
Publication Number | Publication Date |
---|---|
FR439904A true FR439904A (fr) | 1912-06-27 |
Family
ID=8651904
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR15735A Expired FR15735E (fr) | Appareil téléphonique simplifié | ||
FR439904A Expired FR439904A (fr) | 1911-04-19 | Appareil téléphonique simplifié |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR15735A Expired FR15735E (fr) | Appareil téléphonique simplifié |
Country Status (1)
Country | Link |
---|---|
FR (2) | FR439904A (fr) |
-
0
- FR FR15735A patent/FR15735E/fr not_active Expired
-
1911
- 1911-04-19 FR FR439904A patent/FR439904A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR15735E (fr) | 1912-09-09 |
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