GB733577A - Improvements in or relating to busy-tone circuits for use in automatic telephone exchange systems - Google Patents

Improvements in or relating to busy-tone circuits for use in automatic telephone exchange systems

Info

Publication number
GB733577A
GB733577A GB12132/53A GB1213253A GB733577A GB 733577 A GB733577 A GB 733577A GB 12132/53 A GB12132/53 A GB 12132/53A GB 1213253 A GB1213253 A GB 1213253A GB 733577 A GB733577 A GB 733577A
Authority
GB
United Kingdom
Prior art keywords
tube
tubes
potential
subscriber
firing
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
GB12132/53A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB733577A publication Critical patent/GB733577A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/023—Circular saw blades with inserted segments having more than one tooth
    • 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
    • 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
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/525—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using tubes in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
  • Meter Arrangements (AREA)
GB12132/53A 1952-05-05 1953-05-01 Improvements in or relating to busy-tone circuits for use in automatic telephone exchange systems Expired GB733577A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL313271X 1952-05-05

Publications (1)

Publication Number Publication Date
GB733577A true GB733577A (en) 1955-07-13

Family

ID=19783709

Family Applications (2)

Application Number Title Priority Date Filing Date
GB12133/53A Expired GB725733A (en) 1952-05-05 1953-05-01 Improvements in or relating to circuits for use in automatic telephone systems
GB12132/53A Expired GB733577A (en) 1952-05-05 1953-05-01 Improvements in or relating to busy-tone circuits for use in automatic telephone exchange systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB12133/53A Expired GB725733A (en) 1952-05-05 1953-05-01 Improvements in or relating to circuits for use in automatic telephone systems

Country Status (7)

Country Link
US (1) US2739265A (xx)
BE (1) BE519679A (xx)
CH (2) CH313271A (xx)
DE (2) DE923672C (xx)
FR (2) FR1080761A (xx)
GB (2) GB725733A (xx)
NL (4) NL84684C (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862149A (en) * 1953-01-12 1958-11-25 Automatie Telephone & Electric Telecommunication systems
US2872619A (en) * 1954-02-04 1959-02-03 Automatic Telephone & Elect Counting circuits
NL254193A (xx) * 1959-07-29

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2310105A (en) * 1941-04-16 1943-02-02 Gen Electric Counter circuit
US2549769A (en) * 1943-08-31 1951-04-24 Int Standard Electric Corp Arrangement for counting electrical impulses

Also Published As

Publication number Publication date
FR1080761A (fr) 1954-12-13
US2739265A (en) 1956-03-20
BE519679A (xx)
CH313271A (de) 1956-03-31
GB725733A (en) 1955-03-09
NL84684C (xx)
DE923672C (de) 1955-03-07
NL87343C (xx)
NL169331B (nl)
CH315217A (de) 1956-07-31
FR1080760A (fr) 1954-12-13
DE923673C (de) 1955-04-04
NL89685C (xx)

Similar Documents

Publication Publication Date Title
GB656693A (en) Improvements in or relating to automatic telephone apparatus
GB648375A (en) Telecommunication system
GB704108A (en) Telephone switching systems employing gas discharge tubes
GB707760A (en) Improvements in or relating to selector circuits for use in automatic telephone-exchange and like systems
GB733577A (en) Improvements in or relating to busy-tone circuits for use in automatic telephone exchange systems
US2668931A (en) Electronic register for telephone switching systems
US3355555A (en) Private branch telephone system with camp-on facilities
GB800657A (en) Improvements in or relating to subscribers' circuits for telephone exchange systems
US2763722A (en) Busy tone circuit for automatic telephone systems
US2533677A (en) Electronic device for timing toll calls and for signaling both subscriber and operator
DE891554C (de) Schaltungsanordnung zur Steuerung von Sekundaerelektronenstrecken enthaltenden Entladungsroehren, vorzugsweise in Fernsprechanlagen
US2339438A (en) Telephone system
GB707504A (en) Improvements in or relating to electronic dialling circuits
US2559312A (en) Crossbar tandem office for telephone systems
US2915591A (en) Telephone system trunk circuit
GB788592A (en) Improvements in or relating to selector switches and to automatic telecommunication systems using such selector switches
USRE22958E (en) Telekiione system
GB684531A (en) Improvements in or relating to telephone systems
US2006489A (en) Telephone system
US2542999A (en) Telecommunication system
US3041410A (en) Delay busy circuit
US3267219A (en) Paging system
GB719085A (en) Electronic telephone systems
GB543065A (en) Improvements in or relating to telephone systems
US2145079A (en) Telephone system