FR604660A - Improvements to telephone receivers - Google Patents

Improvements to telephone receivers

Info

Publication number
FR604660A
FR604660A FR604660DA FR604660A FR 604660 A FR604660 A FR 604660A FR 604660D A FR604660D A FR 604660DA FR 604660 A FR604660 A FR 604660A
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 FR604660A publication Critical patent/FR604660A/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)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)
FR604660D 1925-07-08 1925-09-17 Improvements to telephone receivers Expired FR604660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17546/25A GB248245A (en) 1925-07-08 1925-07-08 Improvements in telephone receivers

Publications (1)

Publication Number Publication Date
FR604660A true FR604660A (en) 1926-05-11

Family

ID=10097071

Family Applications (1)

Application Number Title Priority Date Filing Date
FR604660D Expired FR604660A (en) 1925-07-08 1925-09-17 Improvements to telephone receivers

Country Status (4)

Country Link
US (2) US1642777A (en)
FR (1) FR604660A (en)
GB (1) GB248245A (en)
NL (1) NL17195C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443667A (en) * 1982-01-11 1984-04-17 Bell Telephone Laboratories, Incorporated Electromagnetic transducer

Also Published As

Publication number Publication date
US1642777A (en) 1927-09-20
US1642778A (en) 1927-09-20
GB248245A (en) 1926-03-04
NL17195C (en)

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