Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M3/00—Automatic or semi-automatic exchanges
  • H04M3/42—Systems providing special services or facilities to subscribers
  • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M9/00—Arrangements for interconnection not involving centralised switching
  • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
  • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
  • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Telephonic Communication Services (AREA)
• Telephone Function (AREA)
• Sub-Exchange Stations And Push- Button Telephones (AREA)
• Structure Of Telephone Exchanges (AREA)
• Devices For Supply Of Signal Current (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19821159

Family Applications (1)

Country Status (8)

Families Citing this family (3)

• 1974
  • 1974-04-11 NL NL7404995A patent/NL7404995A/xx not_active Application Discontinuation
• 1975
  • 1975-03-19 SE SE7503102A patent/SE409537B/xx unknown
  • 1975-04-04 FI FI751008A patent/FI60475C/sv not_active IP Right Cessation
  • 1975-04-09 GB GB14709/75A patent/GB1501704A/en not_active Expired
  • 1975-04-09 FR FR7511124A patent/FR2267670B1/fr not_active Expired
  • 1975-04-10 NO NO751275A patent/NO141875B/no unknown
  • 1975-04-10 IT IT22266/75A patent/IT1037245B/it active
  • 1975-04-10 DK DK154475A patent/DK154475A/da not_active IP Right Cessation

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