FR38401E - Safety switch for telephones subjected to high voltages - Google Patents

Safety switch for telephones subjected to high voltages

Info

Publication number
FR38401E
FR38401E FR38401DA FR38401E FR 38401 E FR38401 E FR 38401E FR 38401D A FR38401D A FR 38401DA FR 38401 E FR38401 E FR 38401E
Authority
FR
France
Prior art keywords
telephones
subjected
safety switch
high voltages
voltages
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
Other languages
French (fr)
Inventor
Arturo Perego
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 filed Critical
Application granted granted Critical
Publication of FR38401E publication Critical patent/FR38401E/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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR38401D 1930-03-20 1930-03-20 Safety switch for telephones subjected to high voltages Expired FR38401E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR38401T 1930-03-20

Publications (1)

Publication Number Publication Date
FR38401E true FR38401E (en) 1931-06-03

Family

ID=8674898

Family Applications (1)

Application Number Title Priority Date Filing Date
FR38401D Expired FR38401E (en) 1930-03-20 1930-03-20 Safety switch for telephones subjected to high voltages

Country Status (1)

Country Link
FR (1) FR38401E (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051332B (en) * 1957-01-11 1959-02-26 Siemens Ag Overvoltage protection device for subscriber devices on telecommunication lines affected by high currents
DE1118266B (en) * 1959-08-21 1961-11-30 Siemens Ag Choke for the effective reduction of inadmissible high-frequency voltages occurring on the subscriber line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051332B (en) * 1957-01-11 1959-02-26 Siemens Ag Overvoltage protection device for subscriber devices on telecommunication lines affected by high currents
DE1118266B (en) * 1959-08-21 1961-11-30 Siemens Ag Choke for the effective reduction of inadmissible high-frequency voltages occurring on the subscriber line

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