FR676502A - Perfectionnements aux phonographes et aux reproducteurs analogues - Google Patents

Perfectionnements aux phonographes et aux reproducteurs analogues

Info

Publication number
FR676502A
FR676502A FR676502DA FR676502A FR 676502 A FR676502 A FR 676502A FR 676502D A FR676502D A FR 676502DA FR 676502 A FR676502 A FR 676502A
Authority
FR
France
Prior art keywords
reproducers
phonographs
similar
similar reproducers
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)
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Application granted granted Critical
Publication of FR676502A publication Critical patent/FR676502A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/004—Transducers other than those covered by groups H04R9/00 - H04R21/00 using ionised gas

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
FR676502D 1928-06-14 1929-06-11 Perfectionnements aux phonographes et aux reproducteurs analogues Expired FR676502A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1728728A GB319049A (en) 1928-06-14 1928-06-14 Improvements in or relating to gramophone and the like reproducers

Publications (1)

Publication Number Publication Date
FR676502A true FR676502A (fr) 1930-02-24

Family

ID=10092550

Family Applications (1)

Application Number Title Priority Date Filing Date
FR676502D Expired FR676502A (fr) 1928-06-14 1929-06-11 Perfectionnements aux phonographes et aux reproducteurs analogues

Country Status (2)

Country Link
FR (1) FR676502A (fr)
GB (1) GB319049A (fr)

Also Published As

Publication number Publication date
GB319049A (en) 1929-09-16

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