1684028

Information

• Patent Grant
• 1684028

• References
• Source

• Patent Number

  1,684,028

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1928
  96 years ago

• CPC

  • G09C1/08 - the connections being mechanical

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines