1683072

Information

• Patent Grant
• 1683072

• References
• Source

• Patent Number

  1,683,072

• Date Filed

  Not available

• Date Issued

  Tuesday, September 4, 1928
  96 years ago

• CPC

  • G09C3/08 - the connections being electrical

• US Classifications

  • 380 - Cryptography
  • 341 - Coded data generation or conversion