FR554314A - Improvements to telephone receivers - Google Patents

Improvements to telephone receivers

Info

Publication number
FR554314A
FR554314A FR554314DA FR554314A FR 554314 A FR554314 A FR 554314A FR 554314D A FR554314D A FR 554314DA FR 554314 A FR554314 A FR 554314A
Authority
FR
France
Prior art keywords
telephone receivers
receivers
telephone
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
Robert-Jules-Edouard Knoll
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 FR554314A publication Critical patent/FR554314A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR554314D 1922-12-13 1922-06-24 Improvements to telephone receivers Expired FR554314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR27144T 1922-12-13

Publications (1)

Publication Number Publication Date
FR554314A true FR554314A (en) 1923-06-08

Family

ID=8665493

Family Applications (3)

Application Number Title Priority Date Filing Date
FR554314D Expired FR554314A (en) 1922-12-13 1922-06-24 Improvements to telephone receivers
FR26677D Expired FR26677E (en) 1922-12-13 1922-07-20 Improvements to telephone receivers
FR27144D Expired FR27144E (en) 1922-12-13 1922-12-13 Improvements to telephone receivers

Family Applications After (2)

Application Number Title Priority Date Filing Date
FR26677D Expired FR26677E (en) 1922-12-13 1922-07-20 Improvements to telephone receivers
FR27144D Expired FR27144E (en) 1922-12-13 1922-12-13 Improvements to telephone receivers

Country Status (1)

Country Link
FR (3) FR554314A (en)

Also Published As

Publication number Publication date
FR26677E (en) 1924-02-28
FR27144E (en) 1924-05-02

Similar Documents

Publication Publication Date Title
FR30524E (en) Improvements to radio-receivers
FR561429A (en) Improvements to telephone cables
FR571381A (en) Improvements to telephone receivers
FR27144E (en) Improvements to telephone receivers
FR558318A (en) Improvements to telephone receivers
FR565744A (en) Improvements to telephone receivers
FR570811A (en) Improvements to telephone receivers
FR556412A (en) Improvements to speaker phones
FR604660A (en) Improvements to telephone receivers
FR547572A (en) Improvements to telephone receivers
FR582522A (en) Improvements to telephone receivers
FR30857E (en) Improvements to telephone receivers
FR575494A (en) Improvements to telephone receivers
FR565182A (en) Improvements to telephone receivers
FR598466A (en) Improvements to telephone receivers
FR602147A (en) Improvements to telephone receivers
FR594668A (en) Improvements to telephone receivers
FR31600E (en) Improvements to telephone receivers
FR616267A (en) Improvements to telephone receivers
FR601707A (en) Improvements to telephone receivers
FR591763A (en) Improvements to telephone receivers
FR555546A (en) Improvements to telephone headsets
FR536736A (en) Improvements to telephone receivers
FR25839E (en) Improvements to telephone receivers
FR551211A (en) Improvements to telephone devices