1705641

Information

• Patent Grant
• 1705641

• References
• Source

• Patent Number

  1,705,641

• Date Filed

  Not available

• Date Issued

  Tuesday, March 19, 1929
  96 years ago

• CPC

  • G09C1/12 - comprising contact-bearing permutation discs

• US Classifications

  • 380 - Cryptography
  • 341 - Coded data generation or conversion
  • 439 - Electrical connectors