FR579357A - Telephone plate - Google Patents
Telephone plateInfo
- Publication number
- FR579357A FR579357A FR579357DA FR579357A FR 579357 A FR579357 A FR 579357A FR 579357D A FR579357D A FR 579357DA FR 579357 A FR579357 A FR 579357A
- Authority
- FR
- France
- Prior art keywords
- telephone plate
- telephone
- plate
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
- H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR579357T | 1923-06-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR579357A true FR579357A (en) | 1924-10-15 |
Family
ID=8956044
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR579357D Expired FR579357A (en) | 1923-06-14 | 1923-06-14 | Telephone plate |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR579357A (en) |
GB (1) | GB217579A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3236958A (en) * | 1961-04-25 | 1966-02-22 | Electronic Res Associates Inc | Loudspeaker system |
US4048454A (en) * | 1974-12-02 | 1977-09-13 | Barcus Lester M | Sonic transducer employing rigid radiating member |
JPS5379525A (en) * | 1976-12-23 | 1978-07-14 | Sony Corp | Compound diaphtagm for speakers |
-
1923
- 1923-06-14 FR FR579357D patent/FR579357A/en not_active Expired
-
1924
- 1924-06-04 GB GB13588/24A patent/GB217579A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB217579A (en) | 1924-12-24 |
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