1921791

Information

• Patent Grant
• 1921791

• References
• Source

• Patent Number

  1,921,791

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1933
  91 years ago

• CPC

  • G01B3/004 - Scales; Graduations
  • Y10S33/11 - Materials

• US Classifications

  • 033 - Geometrical instruments
  • 073 - Measuring and testing
  • 200 - Electricity: circuit makers and breakers
  • D10 - Measuring, testing, or signalling instruments