FR452222A - Perfectionnement de la transmission téléphonique de la parole - Google Patents

Perfectionnement de la transmission téléphonique de la parole

Info

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
Application number
Other languages
English (en)
Inventor
Pierre-Emmanuel-Emile Raverot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PIERRE-EMMANUEL-EMILE RAVEROT
Original Assignee
PIERRE-EMMANUEL-EMILE RAVEROT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PIERRE-EMMANUEL-EMILE RAVEROT filed Critical PIERRE-EMMANUEL-EMILE RAVEROT
Application granted granted Critical
Publication of FR452222A publication Critical patent/FR452222A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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)
FR452222D 1912-12-20 1912-12-20 Perfectionnement de la transmission téléphonique de la parole Expired FR452222A (fr)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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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