FR529209A - Isolator for telephone receivers - Google Patents

Isolator for telephone receivers

Info

Publication number
FR529209A
FR529209A FR529209A FR529209DA FR529209A FR 529209 A FR529209 A FR 529209A FR 529209 A FR529209 A FR 529209A FR 529209D A FR529209D A FR 529209DA FR 529209 A FR529209 A FR 529209A
Authority
FR
France
Prior art keywords
isolator
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
FR529209A
Other languages
French (fr)
Inventor
Leon-Emmanuel-Bruno Desmarquoy
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.)
LEON EMMANUEL BRUNO DESMARQUOY
Original Assignee
LEON EMMANUEL BRUNO DESMARQUOY
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 LEON EMMANUEL BRUNO DESMARQUOY filed Critical LEON EMMANUEL BRUNO DESMARQUOY
Application granted granted Critical
Publication of FR529209A publication Critical patent/FR529209A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR529209A 1920-07-22 1920-07-22 Isolator for telephone receivers Expired FR529209A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR529209T 1920-07-22

Publications (1)

Publication Number Publication Date
FR529209A true FR529209A (en) 1921-11-25

Family

ID=8922578

Family Applications (1)

Application Number Title Priority Date Filing Date
FR529209A Expired FR529209A (en) 1920-07-22 1920-07-22 Isolator for telephone receivers

Country Status (1)

Country Link
FR (1) FR529209A (en)

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