3221561

Information

• Patent Grant
• 3221561

• References
• Source

• Patent Number

  3,221,561

• Date Filed

  Not available

• Date Issued

  Tuesday, December 7, 1965
  59 years ago

• CPC

  • G01D13/24 - for indicating a maximum or minimum

• US Classifications

  • 073 - Measuring and testing
  • 116 - Signals and indicators
  • 250 - Radiant energy
  • 359 - Optical: systems and elements