FR667117A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR667117A
FR667117A FR667117DA FR667117A FR 667117 A FR667117 A FR 667117A FR 667117D A FR667117D A FR 667117DA FR 667117 A FR667117 A FR 667117A
Authority
FR
France
Prior art keywords
telephone systems
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of FR667117A publication Critical patent/FR667117A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Relay Circuits (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Interface Circuits In Exchanges (AREA)
FR667117D 1927-01-07 1927-12-15 Improvements to telephone systems Expired FR667117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US283201XA 1927-01-07 1927-01-07

Publications (1)

Publication Number Publication Date
FR667117A true FR667117A (en) 1929-10-12

Family

ID=21842786

Family Applications (1)

Application Number Title Priority Date Filing Date
FR667117D Expired FR667117A (en) 1927-01-07 1927-12-15 Improvements to telephone systems

Country Status (3)

Country Link
CH (1) CH136195A (en)
FR (1) FR667117A (en)
GB (3) GB294618A (en)

Also Published As

Publication number Publication date
GB283201A (en) 1929-03-14
CH136195A (en) 1929-10-31
GB304702A (en) 1929-03-14
GB294618A (en) 1929-03-14

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