FR490806A - Receiver for telephones and microtelephones - Google Patents
Receiver for telephones and microtelephonesInfo
- Publication number
- FR490806A FR490806A FR490806A FR490806DA FR490806A FR 490806 A FR490806 A FR 490806A FR 490806 A FR490806 A FR 490806A FR 490806D A FR490806D A FR 490806DA FR 490806 A FR490806 A FR 490806A
- Authority
- FR
- France
- Prior art keywords
- microtelephones
- telephones
- receiver
- 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
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL3594T | 1917-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR490806A true FR490806A (en) | 1919-05-10 |
Family
ID=22922333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR490806A Expired FR490806A (en) | 1917-07-16 | 1918-07-10 | Receiver for telephones and microtelephones |
Country Status (4)
Country | Link |
---|---|
US (1) | US1386744A (en) |
FR (1) | FR490806A (en) |
GB (1) | GB123255A (en) |
NL (1) | NL3594C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT315264B (en) * | 1972-07-11 | 1974-05-27 | Akg Akustische Kino Geraete | Headphones for interpreting systems, language schools and the like. |
-
1917
- 1917-07-16 NL NL3594D patent/NL3594C/xx active
-
1918
- 1918-06-13 GB GB9754/18A patent/GB123255A/en not_active Expired
- 1918-07-10 FR FR490806A patent/FR490806A/en not_active Expired
- 1918-07-11 US US244342A patent/US1386744A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US1386744A (en) | 1921-08-09 |
GB123255A (en) | 1919-02-20 |
NL3594C (en) |
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