FR518171A - Improvements made to central telephone offices - Google Patents

Improvements made to central telephone offices

Info

Publication number
FR518171A
FR518171A FR518171A FR518171DA FR518171A FR 518171 A FR518171 A FR 518171A FR 518171 A FR518171 A FR 518171A FR 518171D A FR518171D A FR 518171DA FR 518171 A FR518171 A FR 518171A
Authority
FR
France
Prior art keywords
improvements made
central telephone
telephone offices
offices
central
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
FR518171A
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
Priority claimed from US299962A external-priority patent/US1444781A/en
Application filed by Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR518171A publication Critical patent/FR518171A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
FR518171A 1919-05-26 1920-06-17 Improvements made to central telephone offices Expired FR518171A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US299962A US1444781A (en) 1919-05-26 1919-05-26 Telephone-exchange system
US478894A US1479984A (en) 1919-05-26 1921-06-20 Telephone-exchange system

Publications (1)

Publication Number Publication Date
FR518171A true FR518171A (en) 1921-05-20

Family

ID=26971496

Family Applications (1)

Application Number Title Priority Date Filing Date
FR518171A Expired FR518171A (en) 1919-05-26 1920-06-17 Improvements made to central telephone offices

Country Status (4)

Country Link
US (1) US1479984A (en)
DE (1) DE438283C (en)
FR (1) FR518171A (en)
NL (1) NL13555C (en)

Also Published As

Publication number Publication date
DE438283C (en) 1926-12-16
NL13555C (en)
US1479984A (en) 1924-01-08

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