FR547572A - Improvements to telephone receivers - Google Patents

Improvements to telephone receivers

Info

Publication number
FR547572A
FR547572A FR547572DA FR547572A FR 547572 A FR547572 A FR 547572A FR 547572D A FR547572D A FR 547572DA FR 547572 A FR547572 A FR 547572A
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)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR547572A publication Critical patent/FR547572A/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)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
FR547572D 1920-12-02 1921-11-17 Improvements to telephone receivers Expired FR547572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427805A US1581509A (en) 1920-12-02 1920-12-02 bungerz

Publications (1)

Publication Number Publication Date
FR547572A true FR547572A (en) 1922-12-19

Family

ID=23696356

Family Applications (1)

Application Number Title Priority Date Filing Date
FR547572D Expired FR547572A (en) 1920-12-02 1921-11-17 Improvements to telephone receivers

Country Status (3)

Country Link
US (1) US1581509A (en)
FR (1) FR547572A (en)
GB (1) GB172291A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397110A1 (en) * 1977-07-05 1979-02-02 Ericsson Telefon Ab L M HANDSET AND FIXED PART TELEPHONE DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397110A1 (en) * 1977-07-05 1979-02-02 Ericsson Telefon Ab L M HANDSET AND FIXED PART TELEPHONE DEVICE

Also Published As

Publication number Publication date
US1581509A (en) 1926-04-20
GB172291A (en) 1922-11-23

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