1381453

Information

• Patent Grant
• 1381453

• References
• Source

• Patent Number

  1,381,453

• Date Filed

  Not available

• Date Issued

  Tuesday, June 14, 1921
  103 years ago

• CPC

  • G01C3/24 - using a parallactic triangle with fixed angles and a base of variable length in the observation station

• US Classifications

  • 356 - Optics: measuring and testing