1657411

Information

• Patent Grant
• 1657411

• References
• Source

• Patent Number

  1,657,411

• Date Filed

  Not available

• Date Issued

  Tuesday, January 24, 1928
  97 years ago

• CPC

  • G09C3/08 - the connections being electrical

• US Classifications

  • 380 - Cryptography
  • 234 - Selective cutting