3718349

Information

• Patent Grant
• 3718349

• References
• Source

• Patent Number

  3,718,349

• Date Filed

  Not available

• Date Issued

  Tuesday, February 27, 1973
  51 years ago

• CPC

  • G09C1/02 - by using a ciphering code in chart form

• US Classifications

  • 380 - Cryptography
  • 283 - Printed matter