Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M19/00—Current supply arrangements for telephone systems
  • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
• • 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
  • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
  • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Relay Circuits (AREA)
• Interface Circuits In Exchanges (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10424913

Family Applications (1)

Country Status (10)

Families Citing this family (3)

• 0
  • BE BE788732D patent/BE788732A/en unknown
• 1971
  • 1971-09-13 GB GB4255071A patent/GB1318858A/en not_active Expired
• 1972
  • 1972-07-11 ZA ZA724726A patent/ZA724726B/en unknown
  • 1972-08-28 AU AU46038/72A patent/AU4603872A/en not_active Expired
  • 1972-09-06 AR AR243947A patent/AR193433A1/en active
  • 1972-09-07 DE DE2243994A patent/DE2243994A1/en active Pending
  • 1972-09-08 AT AT776172A patent/AT336691B/en not_active IP Right Cessation
  • 1972-09-12 IT IT29062/72A patent/IT967355B/en active
  • 1972-09-12 CH CH1332572A patent/CH556623A/en not_active IP Right Cessation
  • 1972-09-13 FR FR7232373A patent/FR2153982A5/fr not_active Expired

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