GB507746A - Improvements in or relating to electrical signalling systems - Google Patents

Improvements in or relating to electrical signalling systems

Info

Publication number
GB507746A
GB507746A GB6093/39A GB609339A GB507746A GB 507746 A GB507746 A GB 507746A GB 6093/39 A GB6093/39 A GB 6093/39A GB 609339 A GB609339 A GB 609339A GB 507746 A GB507746 A GB 507746A
Authority
GB
United Kingdom
Prior art keywords
currents
grids
pentode
voltages
circuit
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
GB6093/39A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co 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
Priority to BE431048D priority Critical patent/BE431048A/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB6093/39A priority patent/GB507746A/en
Priority to US235746A priority patent/US2282271A/en
Publication of GB507746A publication Critical patent/GB507746A/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
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
  • Amplifiers (AREA)
GB6093/39A 1937-11-12 1937-11-12 Improvements in or relating to electrical signalling systems Expired GB507746A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE431048D BE431048A (enrdf_load_stackoverflow) 1937-11-12
GB6093/39A GB507746A (en) 1937-11-12 1937-11-12 Improvements in or relating to electrical signalling systems
US235746A US2282271A (en) 1937-11-12 1938-10-19 Electrical signaling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6093/39A GB507746A (en) 1937-11-12 1937-11-12 Improvements in or relating to electrical signalling systems

Publications (1)

Publication Number Publication Date
GB507746A true GB507746A (en) 1939-06-12

Family

ID=9808241

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6093/39A Expired GB507746A (en) 1937-11-12 1937-11-12 Improvements in or relating to electrical signalling systems

Country Status (3)

Country Link
US (1) US2282271A (enrdf_load_stackoverflow)
BE (1) BE431048A (enrdf_load_stackoverflow)
GB (1) GB507746A (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586365A (en) * 1947-03-20 1952-02-19 Westinghouse Electric Corp Means for eliminating spurious frequencies
BE486300A (enrdf_load_stackoverflow) * 1947-07-09
US2561602A (en) * 1947-07-29 1951-07-24 Thomas J Valentino Apparatus for making aural announcements
US2826638A (en) * 1952-04-26 1958-03-11 Bell Telephone Labor Inc Signaling system
US2749390A (en) * 1952-12-02 1956-06-05 Itt Ringing circuit for telephone line and radio order wire
US2806903A (en) * 1954-03-24 1957-09-17 Int Standard Electric Corp Voice frequency signal receivers
DE1487973B2 (de) * 1966-05-12 1970-10-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für einen sprachgeschützten Ein- oder Mehrfrequenz-Signalempfänger

Also Published As

Publication number Publication date
BE431048A (enrdf_load_stackoverflow)
US2282271A (en) 1942-05-05

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