1667757

Information

• Patent Grant
• 1667757

• References
• Source

• Patent Number

  1,667,757

• Date Filed

  Not available

• Date Issued

  Tuesday, May 1, 1928
  96 years ago

• CPC

  • B61L5/1845 - Optical systems, lenses

• US Classifications

  • 340 - Communications: electrical
  • 246 - Railway switches and signals
  • 362 - Illumination