3637992

Information

• Patent Grant
• 3637992

• References
• Source

• Patent Number

  3,637,992

• Date Filed

  Not available

• Date Issued

  Tuesday, January 25, 1972
  52 years ago

• CPC

  • G06K21/04 - in which coincidence of markings is sensed optically

• US Classifications

  • 235 - Registers
  • 073 - Measuring and testing