GB258547A - Improvements in automatic telephone systems - Google Patents

Improvements in automatic telephone systems

Info

Publication number
GB258547A
GB258547A GB12728/26A GB1272826A GB258547A GB 258547 A GB258547 A GB 258547A GB 12728/26 A GB12728/26 A GB 12728/26A GB 1272826 A GB1272826 A GB 1272826A GB 258547 A GB258547 A GB 258547A
Authority
GB
United Kingdom
Prior art keywords
line
relay
operator
short
wiper
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
GB12728/26A
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.)
Deutsche Telephonwerke und Kabelindustrie AG
Original Assignee
Deutsche Telephonwerke und Kabelindustrie AG
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 Deutsche Telephonwerke und Kabelindustrie AG filed Critical Deutsche Telephonwerke und Kabelindustrie AG
Publication of GB258547A publication Critical patent/GB258547A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
    • B66C1/24—Single members engaging the loads from one side only

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

258,547. Deutsche Telephonwerke und Kabelindustrie Akt.-Ges. Sept. 17, 1925, [Convention date]. Automatic and semi-automatic exchange systems.-A calling subscriber N is connected over a " no-normal " line switch W to an operator's position or to numerical switches. Line relay R is maintained energized during conversation, and is short-circuited upon release over an additional wiper IV. Relay R upon energization locks in a local circuit through lamp B and connects up magnet D and switching relay P to the test wiper III. to initiate hunting in the usual manner. When an idle line a, b is found, switching relay P operates, grounds the test wiper to mark the line busy, and closes a further circuit d for relay R. Upon release, a short-circuiting ground is placed on wire d through a delay-device V. If all the lines accessible to the switches such as W are in use, relay G is released, and a buzzer S is connected to a line initiating a call. An operator may identify the line a, b to which a subscriber wanted for a toll call is connected by depressing the key T of each line in turn until his individual lamp B is caused to flicker.
GB12728/26A 1925-09-17 1926-05-18 Improvements in automatic telephone systems Expired GB258547A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE258547X 1925-09-17
DED48784D DE484844C (en) 1925-09-17 1925-09-18 Circuit arrangement for private branch exchanges with dialers for official traffic

Publications (1)

Publication Number Publication Date
GB258547A true GB258547A (en) 1927-03-31

Family

ID=25769863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12728/26A Expired GB258547A (en) 1925-09-17 1926-05-18 Improvements in automatic telephone systems

Country Status (2)

Country Link
DE (1) DE484844C (en)
GB (1) GB258547A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE946352C (en) * 1951-09-16 1956-08-02 Siemens Ag Circuit arrangement for telephone extension systems with dialer operation

Also Published As

Publication number Publication date
DE484844C (en) 1929-10-23

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