FR588714A - Improvements in telephones and similar instruments - Google Patents
Improvements in telephones and similar instrumentsInfo
- Publication number
- FR588714A FR588714A FR588714DA FR588714A FR 588714 A FR588714 A FR 588714A FR 588714D A FR588714D A FR 588714DA FR 588714 A FR588714 A FR 588714A
- Authority
- FR
- France
- Prior art keywords
- telephones
- similar instruments
- instruments
- similar
- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
-
- 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
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB38524A GB246096A (en) | 1924-01-05 | 1924-01-05 | Improvements in telephones and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
FR588714A true FR588714A (en) | 1925-05-14 |
Family
ID=9703474
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR588714D Expired FR588714A (en) | 1924-01-05 | 1924-11-08 | Improvements in telephones and similar instruments |
FR29915D Expired FR29915E (en) | 1924-01-05 | 1924-12-20 | Improvements in telephones and similar instruments |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR29915D Expired FR29915E (en) | 1924-01-05 | 1924-12-20 | Improvements in telephones and similar instruments |
Country Status (2)
Country | Link |
---|---|
FR (2) | FR588714A (en) |
GB (1) | GB246096A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU573382B2 (en) * | 1984-10-15 | 1988-06-02 | Deere & Company | Ultrasonic horn with sidelobe suppression |
US4713799A (en) * | 1984-10-15 | 1987-12-15 | Deere & Company | Ultrasonic horn with sidelobe suppressing centerpiece |
-
1924
- 1924-01-05 GB GB38524A patent/GB246096A/en not_active Expired
- 1924-11-08 FR FR588714D patent/FR588714A/en not_active Expired
- 1924-12-20 FR FR29915D patent/FR29915E/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR29915E (en) | 1925-12-10 |
GB246096A (en) | 1926-01-28 |
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