3820247

Information

• Patent Grant
• 3820247

• References
• Source

• Patent Number

  3,820,247

• Date Filed

  Not available

• Date Issued

  Friday, June 28, 1974
  50 years ago

• CPC

  • G01B3/306 - with inclined slide plane
  • G01B5/242 - Sine bars; Sine plates

• US Classifications

  • 033 - Geometrical instruments