FR571381A - Improvements to telephone receivers - Google Patents
Improvements to telephone receiversInfo
- Publication number
- FR571381A FR571381A FR571381DA FR571381A FR 571381 A FR571381 A FR 571381A FR 571381D A FR571381D A FR 571381DA FR 571381 A FR571381 A FR 571381A
- Authority
- FR
- France
- Prior art keywords
- telephone receivers
- receivers
- 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
- H04R13/02—Telephone receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Multimedia (AREA)
- Hard Magnetic Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Diaphragms And Bellows (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US601483A US1551143A (en) | 1922-11-17 | 1922-11-17 | Telephone receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
FR571381A true FR571381A (en) | 1924-05-16 |
Family
ID=10151470
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR571381D Expired FR571381A (en) | 1922-11-17 | 1923-10-01 | Improvements to telephone receivers |
FR588543D Expired FR588543A (en) | 1922-11-17 | 1924-11-05 | Improvements to telephone receivers |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR588543D Expired FR588543A (en) | 1922-11-17 | 1924-11-05 | Improvements to telephone receivers |
Country Status (3)
Country | Link |
---|---|
US (1) | US1551143A (en) |
FR (2) | FR571381A (en) |
GB (2) | GB207148A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1078174B (en) * | 1956-02-25 | 1960-03-24 | Dr Emil Podszus | Suspension for speaker cones with special damping |
-
1922
- 1922-11-17 US US601483A patent/US1551143A/en not_active Expired - Lifetime
-
1923
- 1923-05-12 GB GB12766/23A patent/GB207148A/en not_active Expired
- 1923-10-01 FR FR571381D patent/FR571381A/en not_active Expired
-
1924
- 1924-09-03 GB GB20775/24A patent/GB235754A/en not_active Expired
- 1924-11-05 FR FR588543D patent/FR588543A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR588543A (en) | 1925-05-08 |
GB235754A (en) | 1925-06-25 |
US1551143A (en) | 1925-08-25 |
GB207148A (en) | 1925-03-19 |
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