GB660521A - Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch - Google Patents

Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch

Info

Publication number
GB660521A
GB660521A GB23375/49A GB2337549A GB660521A GB 660521 A GB660521 A GB 660521A GB 23375/49 A GB23375/49 A GB 23375/49A GB 2337549 A GB2337549 A GB 2337549A GB 660521 A GB660521 A GB 660521A
Authority
GB
United Kingdom
Prior art keywords
switch
condenser
test
voltage
resistance
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
GB23375/49A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB660521A publication Critical patent/GB660521A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB23375/49A 1948-09-13 1949-09-09 Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch Expired GB660521A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL660521X 1948-09-13

Publications (1)

Publication Number Publication Date
GB660521A true GB660521A (en) 1951-11-07

Family

ID=19796331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23375/49A Expired GB660521A (en) 1948-09-13 1949-09-09 Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch

Country Status (4)

Country Link
DE (1) DE807955C (enrdf_load_stackoverflow)
FR (1) FR995224A (enrdf_load_stackoverflow)
GB (1) GB660521A (enrdf_load_stackoverflow)
NL (2) NL142315B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107463984A (zh) * 2017-09-22 2017-12-12 深圳怡化电脑股份有限公司 读卡器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051910B (de) * 1958-08-08 1959-03-05 Telefonbau & Normalzeit Gmbh Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb zur Frittung der in den Sprechadern liegenden Waehler- und/oder Relaiskontakte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107463984A (zh) * 2017-09-22 2017-12-12 深圳怡化电脑股份有限公司 读卡器

Also Published As

Publication number Publication date
DE807955C (de) 1951-07-09
NL142315B (nl)
NL73318C (enrdf_load_stackoverflow)
FR995224A (fr) 1951-11-29

Similar Documents

Publication Publication Date Title
US2275016A (en) Control system
ES377257A1 (es) Mejoras en reles.
US2370727A (en) Time measuring system
GB660521A (en) Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch
US2218629A (en) Protective device for electrical instruments
US1898046A (en) Electric relay device for indicating weak currents
US2460860A (en) Electronic circuit breaker
US2104128A (en) Gas discharge tube delay circuit
US2614152A (en) Dielectric test circuit
US2327791A (en) Time delay apparatus
US2125050A (en) Body charge indicator for trackless trolley coaches
US2475050A (en) Constant current circuit
US2097578A (en) Apparatus for recording steep wave front voltages of short duration
US4420697A (en) Process and apparatus for monitoring thread breakage by the use of a threshold device
US1786910A (en) Testing instrument for electrical condensers
US3405352A (en) Square wave switching circuit having sharp turn-on and turn-off characteristics
US2586395A (en) Circuit cathode-ray oscilloscope
US3739259A (en) Pole synchronization test apparatus for multi-pole circuit breakers
GB655941A (en) Improvements in or relating to electric selecting circuits
US2960635A (en) Relay circuit
SU777747A1 (ru) Устройство дл контрол релейных коммутаторов
US2906874A (en) Triggered pulse generator
USRE19896E (en) Control system
SU582529A1 (ru) Регистр сдвига
US2542998A (en) Matched potential control system