3627993

Information

• Patent Grant
• 3627993

• References
• Source

• Patent Number

  3,627,993

• Date Filed

  Not available

• Date Issued

  Tuesday, December 14, 1971
  53 years ago

• CPC

  • G06K7/085 - metal detectors
  • G07F7/086 - by passive credit-cards adapted therefor

• US Classifications

  • 235 - Registers