FR519037A - Perfectionnements aux récepteurs thermo-téléphoniques - Google Patents

Perfectionnements aux récepteurs thermo-téléphoniques

Info

Publication number
FR519037A
FR519037A FR519037A FR519037DA FR519037A FR 519037 A FR519037 A FR 519037A FR 519037 A FR519037 A FR 519037A FR 519037D A FR519037D A FR 519037DA FR 519037 A FR519037 A FR 519037A
Authority
FR
France
Prior art keywords
thermo
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
FR519037A
Other languages
English (en)
Inventor
Alfred Williams
Leo Daft Williams
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR519037A publication Critical patent/FR519037A/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)
  • Thermistors And Varistors (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
FR519037A 1919-05-03 1920-07-06 Perfectionnements aux récepteurs thermo-téléphoniques Expired FR519037A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB519037X 1919-05-03

Publications (1)

Publication Number Publication Date
FR519037A true FR519037A (fr) 1921-06-03

Family

ID=10461853

Family Applications (1)

Application Number Title Priority Date Filing Date
FR519037A Expired FR519037A (fr) 1919-05-03 1920-07-06 Perfectionnements aux récepteurs thermo-téléphoniques

Country Status (3)

Country Link
DE (1) DE348534C (fr)
FR (1) FR519037A (fr)
GB (1) GB131258A (fr)

Also Published As

Publication number Publication date
GB131258A (fr)
DE348534C (de) 1922-02-11

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