2705902

Information

• Patent Grant
• 2705902

• References
• Source

• Patent Number

  2,705,902

• Date Filed

  Not available

• Date Issued

  Tuesday, April 12, 1955
  70 years ago

• CPC

  • A41H23/00 - Devices for applying chalk Sharpening or holding chalk
  • G01D7/06 - Luminous indications projected on a common screen

• US Classifications

  • 356 - Optics: measuring and testing
  • 116 - Signals and indicators
  • 324 - Electricity: measuring and testing
  • 359 - Optical: systems and elements