FR661145A - Improvements in telephone receivers - Google Patents

Improvements in telephone receivers

Info

Publication number
FR661145A
FR661145A FR661145DA FR661145A FR 661145 A FR661145 A FR 661145A FR 661145D A FR661145D A FR 661145DA FR 661145 A FR661145 A FR 661145A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR661145A publication Critical patent/FR661145A/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)
FR661145D 1927-10-01 1928-09-27 Improvements in telephone receivers Expired FR661145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE661145X 1927-10-01

Publications (1)

Publication Number Publication Date
FR661145A true FR661145A (en) 1929-07-22

Family

ID=20314339

Family Applications (1)

Application Number Title Priority Date Filing Date
FR661145D Expired FR661145A (en) 1927-10-01 1928-09-27 Improvements in telephone receivers

Country Status (2)

Country Link
BE (1) BE354603A (en)
FR (1) FR661145A (en)

Also Published As

Publication number Publication date
BE354603A (en)

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