1841811

Information

• Patent Grant
• 1841811

• References
• Source

• Patent Number

  1,841,811

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1932
  93 years ago

• CPC

  • G03B17/44 - Means for exchanging focusing screen and light sensitive material

• US Classifications

  • 396 - Photography
  • 242 - Winding, tensioning, or guiding