1406775

Information

• Patent Grant
• 1406775

• References
• Source

• Patent Number

  1,406,775

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1922
  103 years ago

• CPC

  • G09C3/06 - the connections being mechanical

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines