3639989

Information

• Patent Grant
• 3639989

• References
• Source

• Patent Number

  3,639,989

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  52 years ago

• CPC

  • G01C21/20 - Instruments for performing navigational calculations
  • G06G3/06 - for evaluating functions by using cams and cam followers

• US Classifications

  • 033 - Geometrical instruments
  • 235 - Registers