1688317

Information

• Patent Grant
• 1688317

• References
• Source

• Patent Number

  1,688,317

• Date Filed

  Not available

• Date Issued

  Tuesday, October 16, 1928
  96 years ago

• CPC

  • G09F13/32 - with moving optical part of parts

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 434 - Education and demonstration