3892921

Information

• Patent Grant
• 3892921

• References
• Source

• Patent Number

  3,892,921

• Date Filed

  Not available

• Date Issued

  Tuesday, July 1, 1975
  50 years ago

• CPC

  • G01R13/405 - using a plurality of active, i.e. light emitting
  • G01H3/00 - Measuring characteristics of vibrations by using a detector in a fluid
  • G01R1/40 - Modifications of instruments to indicate the maximum or the minimum value reached in a time interval

• US Classifications

  • 340 - Communications: electrical
  • 324 - Electricity: measuring and testing
  • 360 - Dynamic magnetic information storage or retrieval