2153194

Information

• Patent Grant
• 2153194

• References
• Source

• Patent Number

  2,153,194

• Date Filed

  Not available

• Date Issued

  Tuesday, April 4, 1939
  85 years ago

• CPC

  • G09C3/08 - the connections being electrical

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines