FR490806A - Receiver for telephones and microtelephones - Google Patents

Receiver for telephones and microtelephones

Info

Publication number
FR490806A
FR490806A FR490806A FR490806DA FR490806A FR 490806 A FR490806 A FR 490806A FR 490806 A FR490806 A FR 490806A FR 490806D A FR490806D A FR 490806DA FR 490806 A FR490806 A FR 490806A
Authority
FR
France
Prior art keywords
microtelephones
telephones
receiver
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
FR490806A
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.)
DE NL THERMO TELEPHOON MIJ NV
Original Assignee
DE NL THERMO TELEPHOON MIJ NV
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 DE NL THERMO TELEPHOON MIJ NV filed Critical DE NL THERMO TELEPHOON MIJ NV
Application granted granted Critical
Publication of FR490806A publication Critical patent/FR490806A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
FR490806A 1917-07-16 1918-07-10 Receiver for telephones and microtelephones Expired FR490806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL3594T 1917-07-16

Publications (1)

Publication Number Publication Date
FR490806A true FR490806A (en) 1919-05-10

Family

ID=22922333

Family Applications (1)

Application Number Title Priority Date Filing Date
FR490806A Expired FR490806A (en) 1917-07-16 1918-07-10 Receiver for telephones and microtelephones

Country Status (4)

Country Link
US (1) US1386744A (en)
FR (1) FR490806A (en)
GB (1) GB123255A (en)
NL (1) NL3594C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT315264B (en) * 1972-07-11 1974-05-27 Akg Akustische Kino Geraete Headphones for interpreting systems, language schools and the like.

Also Published As

Publication number Publication date
US1386744A (en) 1921-08-09
GB123255A (en) 1919-02-20
NL3594C (en)

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