438300

Information

• Patent Grant
• 438300

• References
• Source

• Patent Number

  438,300

• Date Filed

  Not available

• Date Issued

  Tuesday, October 14, 1890
  134 years ago

• CPC

  • G01B5/285 - for controlling eveness
  • Y10S33/11 - Materials

• US Classifications

  • 033 - Geometrical instruments