FR604182A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR604182A
FR604182A FR604182DA FR604182A FR 604182 A FR604182 A FR 604182A FR 604182D A FR604182D A FR 604182DA FR 604182 A FR604182 A FR 604182A
Authority
FR
France
Prior art keywords
speakerphone
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
Gabriel Pelletier
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 FR604182A publication Critical patent/FR604182A/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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/08—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers separated by air or other fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
FR604182D 1924-12-31 1924-12-31 Speakerphone Expired FR604182A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR604182T 1924-12-31

Publications (1)

Publication Number Publication Date
FR604182A true FR604182A (en) 1926-04-30

Family

ID=8973147

Family Applications (1)

Application Number Title Priority Date Filing Date
FR604182D Expired FR604182A (en) 1924-12-31 1924-12-31 Speakerphone

Country Status (2)

Country Link
FR (1) FR604182A (en)
GB (1) GB245457A (en)

Also Published As

Publication number Publication date
GB245457A (en) 1927-03-24

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