IT500077A - - Google Patents

Info

Publication number
IT500077A
IT500077A IT500077DA IT500077A IT 500077 A IT500077 A IT 500077A IT 500077D A IT500077D A IT 500077DA IT 500077 A IT500077 A IT 500077A
Authority
IT
Italy
Application number
Other languages
Italian (it)
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 of IT500077A publication Critical patent/IT500077A/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • 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
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
IT500077D 1952-03-04 IT500077A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1052056T 1952-03-04

Publications (1)

Publication Number Publication Date
IT500077A true IT500077A (ja)

Family

ID=9595063

Family Applications (1)

Application Number Title Priority Date Filing Date
IT500077D IT500077A (ja) 1952-03-04

Country Status (4)

Country Link
CH (1) CH308383A (ja)
FR (3) FR1052054A (ja)
IT (1) IT500077A (ja)
NL (2) NL169510B (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL270678A (ja) * 1960-10-29
US3529105A (en) * 1967-02-15 1970-09-15 Emerson Electric Co Snap switch and thermoresponsive actuator

Also Published As

Publication number Publication date
FR1052054A (fr) 1954-01-21
NL169510B (nl)
CH308383A (fr) 1955-07-15
FR1052055A (fr) 1954-01-21
FR1052056A (fr) 1954-01-21
NL89644C (ja)

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