Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M3/00—Automatic or semi-automatic exchanges
  • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B3/00—Line transmission systems
  • H04B3/02—Details
  • H04B3/42—Circuits for by-passing of ringing signals

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4547839

Family Applications (1)

Country Status (3)

• 0
  • BE BE463852D patent/BE463852A/xx unknown
• 1944
  • 1944-09-13 CH CH241540D patent/CH241540A/de unknown
• 1945
  • 1945-10-23 FR FR916162D patent/FR916162A/fr not_active Expired

Also Published As

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