FR577563A - Improvements in sound transmission and reproduction devices - Google Patents

Improvements in sound transmission and reproduction devices

Info

Publication number
FR577563A
FR577563A FR577563DA FR577563A FR 577563 A FR577563 A FR 577563A FR 577563D A FR577563D A FR 577563DA FR 577563 A FR577563 A FR 577563A
Authority
FR
France
Prior art keywords
sound transmission
reproduction devices
reproduction
devices
sound
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.)
HERALD LAB
Original Assignee
HERALD LAB
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 HERALD LAB filed Critical HERALD LAB
Application granted granted Critical
Publication of FR577563A publication Critical patent/FR577563A/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)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Electromagnets (AREA)
FR577563D 1922-12-02 1924-02-21 Improvements in sound transmission and reproduction devices Expired FR577563A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US604632A US1564968A (en) 1922-12-02 1922-12-02 Sound-reproducing device

Publications (1)

Publication Number Publication Date
FR577563A true FR577563A (en) 1924-08-08

Family

ID=9730579

Family Applications (1)

Application Number Title Priority Date Filing Date
FR577563D Expired FR577563A (en) 1922-12-02 1924-02-21 Improvements in sound transmission and reproduction devices

Country Status (3)

Country Link
US (1) US1564968A (en)
FR (1) FR577563A (en)
GB (1) GB217944A (en)

Also Published As

Publication number Publication date
GB217944A (en) 1924-06-23
US1564968A (en) 1925-12-08

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