1510441

Information

• Patent Grant
• 1510441

• References
• Source

• Patent Number

  1,510,441

• Date Filed

  Not available

• Date Issued

  Tuesday, September 30, 1924
  99 years ago

• CPC

  • G09C3/08 - the connections being electrical

• US Classifications

  • 380 - Cryptography
  • 400 - Typewriting machines