FR478877A - Appareil de transmission des sons - Google Patents

Appareil de transmission des sons

Info

Publication number
FR478877A
FR478877A FR478877DA FR478877A FR 478877 A FR478877 A FR 478877A FR 478877D A FR478877D A FR 478877DA FR 478877 A FR478877 A FR 478877A
Authority
FR
France
Prior art keywords
transmission device
sound transmission
sound
transmission
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.)
UNIVERSAL HIGH POWER TELEPHONE
Original Assignee
UNIVERSAL HIGH POWER TELEPHONE
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 UNIVERSAL HIGH POWER TELEPHONE filed Critical UNIVERSAL HIGH POWER TELEPHONE
Application granted granted Critical
Publication of FR478877A publication Critical patent/FR478877A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/023—Microphones with more than one granular chamber

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR478877D 1915-06-02 1915-06-02 Appareil de transmission des sons Expired FR478877A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR478877T 1915-06-02

Publications (1)

Publication Number Publication Date
FR478877A true FR478877A (fr) 1916-01-14

Family

ID=1516332

Family Applications (1)

Application Number Title Priority Date Filing Date
FR478877D Expired FR478877A (fr) 1915-06-02 1915-06-02 Appareil de transmission des sons

Country Status (1)

Country Link
FR (1) FR478877A (fr)

Similar Documents

Publication Publication Date Title
FR478877A (fr) Appareil de transmission des sons
FR501833A (fr) Appareil de mécanothérapie
FR467451A (fr) Appareil de massage
FR467542A (fr) Appareil de massage
CH74399A (fr) Appareil de massage
CH63702A (fr) Appareil de massage
FR469681A (fr) Appareil de sauvetage
FR471166A (fr) Appareil de sauvetage
FR474181A (fr) Appareil récepteur électro-acoustique
FR19671E (fr) Appareil récepteur électro-acoustique
CH74683A (fr) Appareil de mécano-thérapie
FR468964A (fr) Appareil de massage
FR22124E (fr) Appareil mécanothérapique
FR473827A (fr) Appareil récepteur des ondes hertziennes
FR458248A (fr) Appareil cryptographique
FR513074A (fr) Appareil de divertissement
FR453476A (fr) Appareil de massage
FR17773E (fr) Appareil de massage
FR491218A (fr) Appareil de visée
FR480556A (fr) Appareil perspecteur
CH70527A (fr) Appareil pour la publicité phonique
FR454945A (fr) Appareil de cryptographie
FR475166A (fr) Appareil de mécanothérapie
FR489691A (fr) Appareil de téléphotographie
FR479980A (fr) Appareil de jeu