3906531

Information

• Patent Grant
• 3906531

• References
• Source

• Patent Number

  3,906,531

• Date Filed

  Not available

• Date Issued

  Tuesday, September 16, 1975
  49 years ago

• CPC

  • G03B9/32 - Double blind
  • G03B9/28 - Roller blind or flexible plate

• US Classifications

  • 396 - Photography