1379551

Information

• Patent Grant
• 1379551

• References
• Source

• Patent Number

  1,379,551

• Date Filed

  Not available

• Date Issued

  Tuesday, May 24, 1921
  103 years ago

• CPC

  • G09C1/02 - by using a ciphering code in chart form
  • G06K19/00 - Record carriers for use with machines and with at least a part designed to carry digital markings

• US Classifications

  • 283 - Printed matter
  • 380 - Cryptography