2515492

Information

• Patent Grant
• 2515492

• References
• Source

• Patent Number

  2,515,492

• Date Filed

  Not available

• Date Issued

  Tuesday, July 18, 1950
  74 years ago

• CPC

  • G09C3/02 - with auxiliary keys or keyboards acting on the original key or keyboards

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines