FR693974A - Improvements to automatic or semi-automatic telephone systems - Google Patents

Improvements to automatic or semi-automatic telephone systems

Info

Publication number
FR693974A
FR693974A FR693974DA FR693974A FR 693974 A FR693974 A FR 693974A FR 693974D A FR693974D A FR 693974DA FR 693974 A FR693974 A FR 693974A
Authority
FR
France
Prior art keywords
automatic
semi
telephone systems
automatic telephone
systems
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)
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 FR693974A publication Critical patent/FR693974A/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)
  • Monitoring And Testing Of Exchanges (AREA)
  • Electronic Switches (AREA)
FR693974D 1929-06-05 1930-04-07 Improvements to automatic or semi-automatic telephone systems Expired FR693974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17254/29A GB334578A (en) 1929-06-05 1929-06-05 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
FR693974A true FR693974A (en) 1930-11-27

Family

ID=10091956

Family Applications (1)

Application Number Title Priority Date Filing Date
FR693974D Expired FR693974A (en) 1929-06-05 1930-04-07 Improvements to automatic or semi-automatic telephone systems

Country Status (4)

Country Link
US (1) US1829774A (en)
DE (1) DE571976C (en)
FR (1) FR693974A (en)
GB (1) GB334578A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597007A (en) * 1942-03-31 1952-05-20 Int Standard Electric Corp Common control circuit for operating switches rearward to calling line

Also Published As

Publication number Publication date
GB334578A (en) 1930-09-05
US1829774A (en) 1931-11-03
DE571976C (en) 1933-03-10

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