NL64772C - - Google Patents

Info

Publication number
NL64772C
NL64772C NL64772DA NL64772C NL 64772 C NL64772 C NL 64772C NL 64772D A NL64772D A NL 64772DA NL 64772 C NL64772 C NL 64772C
Authority
NL
Netherlands
Application number
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.)
Publication date
Application granted granted Critical
Publication of NL64772C publication Critical patent/NL64772C/xx

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/403—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local oscillators

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Tests Of Electronic Circuits (AREA)
NL64772D 1944-12-04 NL64772C (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR994001T 1944-12-04

Publications (1)

Publication Number Publication Date
NL64772C true NL64772C (fr) 1900-01-01

Family

ID=9556053

Family Applications (1)

Application Number Title Priority Date Filing Date
NL64772D NL64772C (fr) 1944-12-04

Country Status (5)

Country Link
US (1) US2509365A (fr)
CH (1) CH271783A (fr)
FR (1) FR994001A (fr)
GB (1) GB619217A (fr)
NL (1) NL64772C (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564010A (en) * 1947-07-07 1951-08-14 Bell Telephone Labor Inc Unattended repeater testing by causing the repeaters to oscillate
US2580097A (en) * 1949-12-17 1951-12-25 Bell Telephone Labor Inc System for testing cable repeater
US2669691A (en) * 1951-05-01 1954-02-16 Bell Telephone Labor Inc Broad band testing
DE949490C (de) * 1952-09-11 1956-09-20 Felten & Guilleaume Carlswerk Anordnung zur Sicherung der UEbertragung von Umschaltesignalen ueber eine mit unbemannten Zwischenverstaerkern bestueckte Fernleitung bei Ausfall von Zwischenverstaerkern
US2751578A (en) * 1953-02-04 1956-06-19 Ericsson Telefon Ab L M Fault indicator for plural connected devices
US3054865A (en) * 1959-12-16 1962-09-18 British Telecomm Res Ltd Means for locating an inoperative signalling repeater
US4161635A (en) * 1978-07-31 1979-07-17 Bell Telephone Laboratories, Incorporated Address verification system
US4161634A (en) * 1978-07-31 1979-07-17 Bell Telephone Laboratories, Incorporated Count-down addressing system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1369403A (en) * 1919-03-19 1921-02-22 American Telephone & Telegraph Testing apparatus
US1677967A (en) * 1924-05-29 1928-07-24 American Telephone & Telegraph Radio signaling system
US2021978A (en) * 1932-12-01 1935-11-26 American Telephone & Telegraph Testing system
US2083666A (en) * 1933-09-30 1937-06-15 American Telephone & Telegraph High frequency signaling system
US2017175A (en) * 1934-06-01 1935-10-15 American Telephone & Telegraph Measurement of return loss
US2244751A (en) * 1938-03-10 1941-06-10 Fides Gmbh Method and arrangement for testing amplifiers
US2208417A (en) * 1939-04-07 1940-07-16 Bell Telephone Labor Inc Transmission system
US2260160A (en) * 1940-04-26 1941-10-21 Bell Telephone Labor Inc Location and identification of faults in signaling transmission systems
US2321723A (en) * 1942-06-26 1943-06-15 Bell Telephone Labor Inc Speech transmission system

Also Published As

Publication number Publication date
GB619217A (en) 1949-03-07
FR994001A (fr) 1951-11-09
US2509365A (en) 1950-05-30
CH271783A (fr) 1950-11-15

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