FR518261A - Improvements to common line telephones - Google Patents

Improvements to common line telephones

Info

Publication number
FR518261A
FR518261A FR518261A FR518261DA FR518261A FR 518261 A FR518261 A FR 518261A FR 518261 A FR518261 A FR 518261A FR 518261D A FR518261D A FR 518261DA FR 518261 A FR518261 A FR 518261A
Authority
FR
France
Prior art keywords
common line
line telephones
telephones
common
line
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
FR518261A
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.)
A S ELEKTRISK BUREAU
Elektrisk Bureau AS
Original Assignee
A S ELEKTRISK BUREAU
Elektrisk Bureau AS
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 A S ELEKTRISK BUREAU, Elektrisk Bureau AS filed Critical A S ELEKTRISK BUREAU
Application granted granted Critical
Publication of FR518261A publication Critical patent/FR518261A/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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR518261A 1917-11-15 1920-06-29 Improvements to common line telephones Expired FR518261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO323099X 1917-11-15

Publications (1)

Publication Number Publication Date
FR518261A true FR518261A (en) 1921-05-21

Family

ID=19905222

Family Applications (1)

Application Number Title Priority Date Filing Date
FR518261A Expired FR518261A (en) 1917-11-15 1920-06-29 Improvements to common line telephones

Country Status (4)

Country Link
AT (1) AT80727B (en)
DE (1) DE323099C (en)
FR (1) FR518261A (en)
GB (1) GB120720A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE876709C (en) * 1949-10-28 1953-05-18 Normalzeit G M B H Circuit arrangement for telephone systems
DE3431519C1 (en) * 1984-08-28 1986-01-02 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for connecting digitally operated subscriber terminal devices to telephone switching systems

Also Published As

Publication number Publication date
GB120720A (en) 1919-08-14
DE323099C (en) 1920-07-15
AT80727B (en) 1920-05-25

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