3757923

Information

• Patent Grant
• 3757923

• References
• Source

• Patent Number

  3,757,923

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1973
  51 years ago

• CPC

  • B41J19/38 - adapted for silent return

• US Classifications

  • 400 - Typewriting machines
  • 181 - Acoustics