FR844299A - Acoustic devices - Google Patents

Acoustic devices

Info

Publication number
FR844299A
FR844299A FR844299DA FR844299A FR 844299 A FR844299 A FR 844299A FR 844299D A FR844299D A FR 844299DA FR 844299 A FR844299 A FR 844299A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
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 FR844299A publication Critical patent/FR844299A/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
    • H04R11/00—Transducers of moving-armature or moving-core type

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR844299D 1937-10-06 1938-10-04 Acoustic devices Expired FR844299A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US167546A US2171733A (en) 1937-10-06 1937-10-06 Acoustic device

Publications (1)

Publication Number Publication Date
FR844299A true FR844299A (en) 1939-07-21

Family

ID=22607812

Family Applications (1)

Application Number Title Priority Date Filing Date
FR844299D Expired FR844299A (en) 1937-10-06 1938-10-04 Acoustic devices

Country Status (3)

Country Link
US (1) US2171733A (en)
FR (1) FR844299A (en)
GB (1) GB506480A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642338A (en) * 1944-02-12 1953-06-16 Robert D Pike Method of and apparatus for producing nitric oxide
US2535757A (en) * 1946-06-25 1950-12-26 John J Root Peripherally driven electroacoustical transducer
US2522530A (en) * 1946-10-19 1950-09-19 Bell Telephone Labor Inc Electroacoustic transducer
DE1108267B (en) * 1958-09-12 1961-06-08 Siemens Ag Electroacoustic transducer with ring armature

Also Published As

Publication number Publication date
US2171733A (en) 1939-09-05
GB506480A (en) 1939-05-30

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