Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M3/00—Automatic or semi-automatic exchanges
  • H04M3/22—Arrangements for supervision, monitoring or testing
  • H04M3/36—Statistical metering, e.g. recording occasions when traffic exceeds capacity of trunks
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
  • G11B5/004—Recording on, or reproducing or erasing from, magnetic drums
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
  • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
  • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
  • G11B5/76—Drum carriers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11C—STATIC STORES
  • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
  • G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
  • G11C19/04—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using cores with one aperture or magnetic loop
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
  • H04M15/04—Recording calls, or communications in printed, perforated or other permanent form

Applications Claiming Priority (2)

Publications (1)

Family

ID=31979126

Family Applications (2)

Family Applications After (1)

Country Status (6)

• 0
  • BE BE558941D patent/BE558941A/xx unknown
  • DE DENDAT1072275D patent/DE1072275B/de active Pending
  • NL NL193234D patent/NL193234A/xx unknown
  • BE BE525092D patent/BE525092A/xx unknown
• 1954
  • 1954-12-14 FR FR1134310D patent/FR1134310A/en not_active Expired
  • 1954-12-14 GB GB36105/54A patent/GB759738A/en not_active Expired
• 1956
  • 1956-07-04 GB GB20701/56A patent/GB841949A/en not_active Expired
• 1957
  • 1957-07-01 CH CH361029D patent/CH361029A/en unknown
  • 1957-07-04 FR FR72088D patent/FR72088E/en not_active Expired

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