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; 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)
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

Similar Documents

Publication Publication Date Title
FR459743A (fr) Transmission flexible
FR452222A (fr) Perfectionnement de la transmission téléphonique de la parole
FR17406E (fr) Perfectionnement de la transmission téléphonique de la parole
FR463533A (fr) Grue de chantier
FR461172A (fr) Jarretelle
FR444047A (fr) Releveur d'épis
FR16299E (fr) Transmetteur téléphonique
FR451724A (fr) Transmetteur téléphonique
FR444993A (fr) Récepteur téléphonique
CH63446A (fr) Récepteur télephonique
CH60214A (it) Microfono
CH60402A (de) Mikrophon
FR448085A (fr) Téléphone
ES52965A3 (es) Un procedimiento anunciador aéreo de variada aplicación.
FR450301A (fr) Jarretelles
CH62469A (de) Telephonanlage
NL183C (nl) Telefoonoverdrager
FR449888A (fr) Récepteur radiotélégraphique
FR441611A (fr) Transmission hydraulique
FR460581A (fr) Sirène sous-marine mobile
FR446864A (fr) Bretelle
FR464014A (fr) Jarretelle
CH59765A (de) Mikrotelephonrelais
CH58947A (fr) Marchine parlante
CH65442A (fr) Installation léléphonique