FR488967A - Thermo-téléphones et thermo-microphones perfectionnés - Google Patents

Thermo-téléphones et thermo-microphones perfectionnés

Info

Publication number
FR488967A
FR488967A FR488967A FR488967DA FR488967A FR 488967 A FR488967 A FR 488967A FR 488967 A FR488967 A FR 488967A FR 488967D A FR488967D A FR 488967DA FR 488967 A FR488967 A FR 488967A
Authority
FR
France
Prior art keywords
thermo
microphones
telephones
advanced
advanced thermo
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
FR488967A
Other languages
English (en)
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 FR488967A publication Critical patent/FR488967A/fr
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)
  • Communication Cables (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
FR488967A 1917-03-27 1918-02-19 Thermo-téléphones et thermo-microphones perfectionnés Expired FR488967A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL114418X 1917-03-27

Publications (1)

Publication Number Publication Date
FR488967A true FR488967A (fr) 1918-12-03

Family

ID=32294140

Family Applications (1)

Application Number Title Priority Date Filing Date
FR488967A Expired FR488967A (fr) 1917-03-27 1918-02-19 Thermo-téléphones et thermo-microphones perfectionnés

Country Status (4)

Country Link
DE (1) DE314664C (Direct)
FR (1) FR488967A (Direct)
GB (1) GB114418A (Direct)
NL (1) NL3740C (Direct)

Also Published As

Publication number Publication date
DE314664C (Direct)
GB114418A (en) 1918-04-18
NL3740C (Direct)

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