3752920

Information

• Patent Grant
• 3752920

• References
• Source

• Patent Number

  3,752,920

• Date Filed

  Not available

• Date Issued

  Tuesday, August 14, 1973
  50 years ago

• CPC

  • G09C3/04 - wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member

• US Classifications

  • 380 - Cryptography