3021937

Information

• Patent Grant
• 3021937

• References
• Source

• Patent Number

  3,021,937

• Date Filed

  Not available

• Date Issued

  Tuesday, February 20, 1962
  63 years ago

• CPC

  • B41J29/68 - by completion of a page or predetermined number of lines or exhaustion of paper to lock the keyboard
  • B41J5/22 - Interlocks between keys

• US Classifications

  • 400 - Typewriting machines