1570178

Information

• Patent Grant
• 1570178

• References
• Source

• Patent Number

  1,570,178

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1926
  99 years ago

• CPC

  • G09C1/02 - by using a ciphering code in chart form

• US Classifications

  • 380 - Cryptography