FR517422A - Transmetteur téléphonique perfectionné - Google Patents

Transmetteur téléphonique perfectionné

Info

Publication number
FR517422A
FR517422A FR517422A FR517422DA FR517422A FR 517422 A FR517422 A FR 517422A FR 517422 A FR517422 A FR 517422A FR 517422D A FR517422D A FR 517422DA FR 517422 A FR517422 A FR 517422A
Authority
FR
France
Prior art keywords
telephone transmitter
advanced telephone
advanced
transmitter
telephone
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
FR517422A
Other languages
English (en)
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.)
MIESSNER INVENTIONS Corp
Miessner Inventions Inc
Original Assignee
MIESSNER INVENTIONS Corp
Miessner Inventions Inc
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 MIESSNER INVENTIONS Corp, Miessner Inventions Inc filed Critical MIESSNER INVENTIONS Corp
Application granted granted Critical
Publication of FR517422A publication Critical patent/FR517422A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR517422A 1919-06-23 1920-06-18 Transmetteur téléphonique perfectionné Expired FR517422A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US517422XA 1919-06-23 1919-06-23

Publications (1)

Publication Number Publication Date
FR517422A true FR517422A (fr) 1921-05-06

Family

ID=21973112

Family Applications (1)

Application Number Title Priority Date Filing Date
FR517422A Expired FR517422A (fr) 1919-06-23 1920-06-18 Transmetteur téléphonique perfectionné

Country Status (1)

Country Link
FR (1) FR517422A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276996A2 (fr) * 1987-01-29 1988-08-03 Crystalate Electronics Limited Microphone
EP0951797A1 (fr) * 1997-01-12 1999-10-27 Umevoice Inc. Dispositif antibruit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276996A2 (fr) * 1987-01-29 1988-08-03 Crystalate Electronics Limited Microphone
EP0276996A3 (fr) * 1987-01-29 1989-11-23 Crystalate Electronics Limited Microphone
EP0951797A1 (fr) * 1997-01-12 1999-10-27 Umevoice Inc. Dispositif antibruit
EP0951797A4 (fr) * 1997-01-12 2006-05-10 Umevoice Inc Dispositif antibruit

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