2151452

Information

• Patent Grant
• 2151452

• References
• Source

• Patent Number

  2,151,452

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1939
  86 years ago

• CPC

  • G09C3/08 - the connections being electrical

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines