Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M19/00—Current supply arrangements for telephone systems
  • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Telephonic Communication Services (AREA)
• Devices For Supply Of Signal Current (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9084647

Family Applications (1)

Country Status (8)

• 0
  • BE BE789970D patent/BE789970A/xx unknown
• 1971
  • 1971-10-20 FR FR7137681A patent/FR2157159A5/fr not_active Expired
• 1972
  • 1972-10-09 CH CH1483772A patent/CH565488A5/xx not_active IP Right Cessation
  • 1972-10-16 DE DE19722250647 patent/DE2250647A1/de active Pending
  • 1972-10-18 IT IT3057972A patent/IT969631B/it active
  • 1972-10-19 SE SE1348872A patent/SE389251B/xx unknown
  • 1972-10-20 NL NL7214189A patent/NL7214189A/xx not_active Application Discontinuation
  • 1972-10-20 GB GB4832272A patent/GB1413312A/en not_active Expired

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