1455157

Information

• Patent Grant
• 1455157

• References
• Source

• Patent Number

  1,455,157

• Date Filed

  Not available

• Date Issued

  Tuesday, May 15, 1923
  101 years ago

• CPC

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

• US Classifications

  • 283 - Printed matter