Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/02—Constructional features of telephone sets
  • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
  • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/26—Devices for calling a subscriber
  • H04M1/30—Devices which can set up and transmit only one digit at a time
  • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Monitoring And Testing Of Exchanges (AREA)
• Push-Button Switches (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7513609

Family Applications (1)

Country Status (6)

Families Citing this family (1)

• 1963
  • 1963-09-11 DE DES87233A patent/DE1179264B/de active Pending
• 1964
  • 1964-09-07 SE SE1074664A patent/SE368894B/xx unknown
  • 1964-09-09 GB GB3687064A patent/GB1030074A/en not_active Expired
  • 1964-09-09 CH CH1174164A patent/CH423889A/de unknown
  • 1964-09-10 NL NL6410546A patent/NL145737B/xx unknown
  • 1964-09-11 BE BE652976D patent/BE652976A/xx unknown

Also Published As

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