1985731

Information

• Patent Grant
• 1985731

• References
• Source

• Patent Number

  1,985,731

• Date Filed

  Not available

• Date Issued

  Tuesday, December 25, 1934
  90 years ago

• CPC

  • G03B33/14 - using lenticular screens

• US Classifications

  • 352 - Optics: motion pictures
  • 355 - Photocopying