1894021

Information

• Patent Grant
• 1894021

• References
• Source

• Patent Number

  1,894,021

• Date Filed

  Not available

• Date Issued

  Tuesday, January 10, 1933
  92 years ago

• CPC

  • G03B17/24 - with means for separately producing marks on the film
  • G03B2217/245 - Mechanical devices

• US Classifications

  • 396 - Photography