FR443965A - Apparatus for strengthening or reproducing telephone currents - Google Patents

Apparatus for strengthening or reproducing telephone currents

Info

Publication number
FR443965A
FR443965A FR443965A FR443965DA FR443965A FR 443965 A FR443965 A FR 443965A FR 443965 A FR443965 A FR 443965A FR 443965D A FR443965D A FR 443965DA FR 443965 A FR443965 A FR 443965A
Authority
FR
France
Prior art keywords
strengthening
telephone currents
reproducing
reproducing telephone
currents
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
FR443965A
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 FR443965A publication Critical patent/FR443965A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
FR443965A 1911-05-25 1912-05-18 Apparatus for strengthening or reproducing telephone currents Expired FR443965A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US443965XA 1911-05-25 1911-05-25

Publications (1)

Publication Number Publication Date
FR443965A true FR443965A (en) 1912-10-07

Family

ID=6012975

Family Applications (2)

Application Number Title Priority Date Filing Date
FR17177A Expired FR17177E (en) 1911-05-25 Apparatus for strengthening or reproducing telephone currents
FR443965A Expired FR443965A (en) 1911-05-25 1912-05-18 Apparatus for strengthening or reproducing telephone currents

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR17177A Expired FR17177E (en) 1911-05-25 Apparatus for strengthening or reproducing telephone currents

Country Status (3)

Country Link
DE (1) DE272989C (en)
FR (2) FR443965A (en)
NL (1) NL2305C (en)

Also Published As

Publication number Publication date
DE272989C (en)
FR17177E (en) 1913-07-03
NL2305C (en)

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