3863143

Information

• Patent Grant
• 3863143

• References
• Source

• Patent Number

  3,863,143

• Date Filed

  Not available

• Date Issued

  Tuesday, January 28, 1975
  50 years ago

• CPC

  • G07C3/12 - in graphical form

• US Classifications

  • 324 - Electricity: measuring and testing
  • 346 - Recorders