2121211

Information

• Patent Grant
• 2121211

• References
• Source

• Patent Number

  2,121,211

• Date Filed

  Not available

• Date Issued

  Tuesday, June 21, 1938
  86 years ago

• CPC

  • G01D5/305 - controlling the movement of a following part
  • G05B19/124 - using tapes, cards or discs with optically sensed marks or codes
  • G05B2219/23202 - Curve, surface represents analog value, line, surface follower
  • Y10S33/03 - Photoelectric
  • Y10T409/303584 - Photocell

• US Classifications

  • 318 - Electricity: motive power systems
  • 033 - Geometrical instruments
  • 250 - Radiant energy
  • 266 - Metallurgical apparatus
  • 369 - Dynamic information storage or retrieval
  • 382 - Image analysis
  • 409 - Gear cutting, milling, or planing