FR567695A - Improvements in hearing devices - Google Patents

Improvements in hearing devices

Info

Publication number
FR567695A
FR567695A FR567695DA FR567695A FR 567695 A FR567695 A FR 567695A FR 567695D A FR567695D A FR 567695DA FR 567695 A FR567695 A FR 567695A
Authority
FR
France
Prior art keywords
hearing devices
hearing
devices
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
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR567695A publication Critical patent/FR567695A/en
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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
FR567695D 1922-10-06 1923-06-21 Improvements in hearing devices Expired FR567695A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US592675A US1859892A (en) 1922-10-06 1922-10-06 Acoustic device

Publications (1)

Publication Number Publication Date
FR567695A true FR567695A (en) 1924-03-07

Family

ID=9817878

Family Applications (1)

Application Number Title Priority Date Filing Date
FR567695D Expired FR567695A (en) 1922-10-06 1923-06-21 Improvements in hearing devices

Country Status (3)

Country Link
US (1) US1859892A (en)
FR (1) FR567695A (en)
GB (2) GB216946A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076520A (en) * 1959-05-21 1963-02-05 Claude C Farwell Loud speaker
US3985201A (en) * 1974-10-24 1976-10-12 Kloster Glenn R Infinite sound reproduction chamber
US5198624A (en) * 1988-02-10 1993-03-30 Linaeum Corporation Audio transducer with controlled flexibility diaphragm
US4903308A (en) * 1988-02-10 1990-02-20 Linaeum Corporation Audio transducer with controlled flexibility diaphragm
US20070251759A1 (en) * 2006-04-26 2007-11-01 Eric Neiman Bass speaker stand

Also Published As

Publication number Publication date
GB216946A (en) 1924-06-10
US1859892A (en) 1932-05-24
GB229786A (en) 1925-03-05

Similar Documents

Publication Publication Date Title
FR567695A (en) Improvements in hearing devices
FR622089A (en) Improvements in cinematographs
FR568595A (en) Improvements in secateurs
FR543240A (en) Improvements in electro-therapeutic devices
FR558401A (en) Improvements in funnels
FR597060A (en) Improvements in hearing devices
FR562915A (en) Further development in vacuum-operated devices
FR597966A (en) Improvements in mixing devices
FR594986A (en) Improvements in loudspeakers
FR594985A (en) Improvements in loudspeakers
FR597224A (en) Improvements in plows
FR562014A (en) Improvements in advertising devices
FR551454A (en) Improvements in cinematographic equipment
FR557356A (en) Improvements in ventilation-humidification installations
FR558196A (en) Improvements in areoplanes
FR551141A (en) Improvements in cinematographs
FR600923A (en) Improvements in loudspeaker construction
FR550756A (en) Improvements in dust collectors
FR583728A (en) Improvements in t devices. s. f.
FR587123A (en) Improvements in bras
FR27209E (en) Improvements in electro-magnetic devices
FR554825A (en) Improvements in mechanical presses
FR591102A (en) Improvements in talking machines
FR590335A (en) Improvements in cinematographic equipment
FR548091A (en) Improvements in mechanically operated advertisements