FR643898A - Improvements to phonographs and loudspeakers - Google Patents

Improvements to phonographs and loudspeakers

Info

Publication number
FR643898A
FR643898A FR643898DA FR643898A FR 643898 A FR643898 A FR 643898A FR 643898D A FR643898D A FR 643898DA FR 643898 A FR643898 A FR 643898A
Authority
FR
France
Prior art keywords
phonographs
loudspeakers
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)
Inventor
Luc-Leon-Basile Denis
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 filed Critical
Application granted granted Critical
Publication of FR643898A publication Critical patent/FR643898A/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
    • 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
    • H04R11/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR643898D 1928-05-22 1927-04-14 Improvements to phonographs and loudspeakers Expired FR643898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR35678T 1928-05-22

Publications (1)

Publication Number Publication Date
FR643898A true FR643898A (en) 1928-09-25

Family

ID=8672525

Family Applications (2)

Application Number Title Priority Date Filing Date
FR643898D Expired FR643898A (en) 1928-05-22 1927-04-14 Improvements to phonographs and loudspeakers
FR35678D Expired FR35678E (en) 1928-05-22 1928-05-22 Improvements to phonographs and loudspeakers

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR35678D Expired FR35678E (en) 1928-05-22 1928-05-22 Improvements to phonographs and loudspeakers

Country Status (1)

Country Link
FR (2) FR643898A (en)

Also Published As

Publication number Publication date
FR35678E (en) 1930-03-27

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