Classifications

• • 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
  • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
  • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
  • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q3/00—Selecting arrangements

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Telephonic Communication Services (AREA)
• Monitoring And Testing Of Exchanges (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6116240

Family Applications (1)

Country Status (5)

Family Cites Families (3)

• 0
  • BE BE514161D patent/BE514161A/xx unknown
• 1952
  • 1952-06-30 CH CH304209D patent/CH304209A/de unknown
  • 1952-07-23 GB GB18689/52A patent/GB712013A/en not_active Expired
  • 1952-09-15 FR FR1062981D patent/FR1062981A/fr not_active Expired
  • 1952-12-01 US US323365A patent/US2744164A/en not_active Expired - Lifetime

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