1905593

Information

• Patent Grant
• 1905593

• References
• Source

• Patent Number

  1,905,593

• Date Filed

  Not available

• Date Issued

  Tuesday, April 25, 1933
  91 years ago

• CPC

  • G09C1/12 - comprising contact-bearing permutation discs

• US Classifications

  • 380 - Cryptography