GB257307A - Improvements in telephone exchange systems - Google Patents

Improvements in telephone exchange systems

Info

Publication number
GB257307A
GB257307A GB858925A GB858925A GB257307A GB 257307 A GB257307 A GB 257307A GB 858925 A GB858925 A GB 858925A GB 858925 A GB858925 A GB 858925A GB 257307 A GB257307 A GB 257307A
Authority
GB
United Kingdom
Prior art keywords
chain
impulses
relays
energized
dialled
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
GB858925A
Other languages
English (en)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB257307A publication Critical patent/GB257307A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
GB858925A 1925-03-31 1925-03-31 Improvements in telephone exchange systems Expired GB257307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1211026A GB256544A (en) 1925-03-31 1925-03-31 Improvements in telephone exchange systems

Publications (1)

Publication Number Publication Date
GB257307A true GB257307A (en) 1926-08-31

Family

ID=9998553

Family Applications (2)

Application Number Title Priority Date Filing Date
GB858925A Expired GB257307A (en) 1925-03-31 1925-03-31 Improvements in telephone exchange systems
GB1211026A Expired GB256544A (en) 1925-03-31 1925-03-31 Improvements in telephone exchange systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1211026A Expired GB256544A (en) 1925-03-31 1925-03-31 Improvements in telephone exchange systems

Country Status (3)

Country Link
FR (1) FR613686A (enExample)
GB (2) GB257307A (enExample)
NL (1) NL256544A (enExample)

Also Published As

Publication number Publication date
GB256544A (en) 1926-08-03
NL256544A (enExample)
FR613686A (fr) 1926-11-26

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