1431657

Information

• Patent Grant
• 1431657

• References
• Source

• Patent Number

  1,431,657

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1922
  102 years ago

• CPC

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

• US Classifications

  • 396 - Photography