2202517

Information

• Patent Grant
• 2202517

• References
• Source

• Patent Number

  2,202,517

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1940
  84 years ago

• CPC

  • H04M11/005 - using recorded signals
  • G01F23/44 - using electrically actuated indicating means

• US Classifications

  • 379 - Telephonic communications
  • 073 - Measuring and testing
  • 340 - Communications: electrical
  • 369 - Dynamic information storage or retrieval