3429638

Information

• Patent Grant
• 3429638

• References
• Source

• Patent Number

  3,429,638

• Date Filed

  Not available

• Date Issued

  Tuesday, February 25, 1969
  55 years ago

• CPC

  • B42D9/00 - Bookmarkers Spot indicators Devices for holding books open Leaf turners
  • B41J29/18 - Mechanisms for rendering the print visible to the operator
  • B42D9/008 - Devices for indicating a spot on a sheet
  • G02B25/00 - Eyepieces Magnifying glasses
  • G02B27/021 - Reading apparatus

• US Classifications

  • 359 - Optical: systems and elements