2028772

Information

• Patent Grant
• 2028772

• References
• Source

• Patent Number

  2,028,772

• Date Filed

  Not available

• Date Issued

  Tuesday, January 28, 1936
  89 years ago

• CPC

  • G09C1/14 - involving removable or interchangeable coding numbers

• US Classifications

  • 380 - Cryptography