3845491

Information

• Patent Grant
• 3845491

• References
• Source

• Patent Number

  3,845,491

• Date Filed

  Not available

• Date Issued

  Tuesday, October 29, 1974
  50 years ago

• CPC

  • G01D9/12 - recording occurring continuously

• US Classifications

  • 346 - Recorders
  • 434 - Education and demonstration