2174529

Information

• Patent Grant
• 2174529

• References
• Source

• Patent Number

  2,174,529

• Date Filed

  Not available

• Date Issued

  Tuesday, October 3, 1939
  85 years ago

• CPC

  • G03B21/32 - Details specially adapted for motion-picture projection
  • G03B21/48 - for altering frame speed for regulating constancy of film speed

• US Classifications

  • 352 - Optics: motion pictures
  • 188 - Brakes