1880028

Information

• Patent Grant
• 1880028

• References
• Source

• Patent Number

  1,880,028

• Date Filed

  Not available

• Date Issued

  Tuesday, September 27, 1932
  92 years ago

• CPC

  • A61B3/02 - Subjective types
  • Y10S29/054 - Fluid control interrelated with machine tool mechanism

• US Classifications

  • 351 - Optics: eye examining, vision testing and correcting
  • 029 - Metal working
  • 040 - Card, picture, or sign exhibiting