FR452222A - Perfectionnement de la transmission téléphonique de la parole - Google Patents
Perfectionnement de la transmission téléphonique de la paroleInfo
- Publication number
- FR452222A FR452222A FR452222DA FR452222A FR 452222 A FR452222 A FR 452222A FR 452222D A FR452222D A FR 452222DA FR 452222 A FR452222 A FR 452222A
- Authority
- FR
- France
- Prior art keywords
- improvement
- speech transmission
- telephone speech
- telephone
- transmission
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR452222T | 1912-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR452222A true FR452222A (fr) | 1913-05-10 |
Family
ID=1492461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR452222D Expired FR452222A (fr) | 1912-12-20 | 1912-12-20 | Perfectionnement de la transmission téléphonique de la parole |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR452222A (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5560780A (en) * | 1993-04-22 | 1996-10-01 | Applied Materials, Inc. | Protective coating for dielectric material on wafer support used in integrated circuit processing apparatus and method of forming same |
US5961774A (en) * | 1993-09-16 | 1999-10-05 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
US6524428B2 (en) | 1993-09-16 | 2003-02-25 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
-
1912
- 1912-12-20 FR FR452222D patent/FR452222A/fr not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5560780A (en) * | 1993-04-22 | 1996-10-01 | Applied Materials, Inc. | Protective coating for dielectric material on wafer support used in integrated circuit processing apparatus and method of forming same |
US5961774A (en) * | 1993-09-16 | 1999-10-05 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
US6221201B1 (en) | 1993-09-16 | 2001-04-24 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
US6336991B1 (en) | 1993-09-16 | 2002-01-08 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
US6524428B2 (en) | 1993-09-16 | 2003-02-25 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
US6544379B2 (en) | 1993-09-16 | 2003-04-08 | Hitachi, Ltd. | Method of holding substrate and substrate holding system |
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