GB644112A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB644112A
GB644112A GB5097/48A GB509748A GB644112A GB 644112 A GB644112 A GB 644112A GB 5097/48 A GB5097/48 A GB 5097/48A GB 509748 A GB509748 A GB 509748A GB 644112 A GB644112 A GB 644112A
Authority
GB
United Kingdom
Prior art keywords
relay
relays
trunk
channel
operator
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
GB5097/48A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB644112A publication Critical patent/GB644112A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
GB5097/48A 1940-01-05 1948-02-20 Improvements in or relating to telephone systems Expired GB644112A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US312468A US2277600A (en) 1940-01-05 1940-01-05 Telephone system

Publications (1)

Publication Number Publication Date
GB644112A true GB644112A (en) 1950-10-04

Family

ID=23211593

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5097/48A Expired GB644112A (en) 1940-01-05 1948-02-20 Improvements in or relating to telephone systems

Country Status (4)

Country Link
US (2) US2277600A (enrdf_load_stackoverflow)
FR (1) FR959818A (enrdf_load_stackoverflow)
GB (1) GB644112A (enrdf_load_stackoverflow)
NL (1) NL70955C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110830073A (zh) * 2018-08-07 2020-02-21 中兴通讯股份有限公司 耳机线复用方法及装置、移动终端、存储介质

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019730A (en) * 1947-01-17 1962-02-06 Wilson R Maltby Induction mine firing and timing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110830073A (zh) * 2018-08-07 2020-02-21 中兴通讯股份有限公司 耳机线复用方法及装置、移动终端、存储介质

Also Published As

Publication number Publication date
USRE22476E (en) 1944-05-09
NL70955C (enrdf_load_stackoverflow)
FR959818A (enrdf_load_stackoverflow) 1950-04-06
US2277600A (en) 1942-03-24

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