2180683

Information

• Patent Grant
• 2180683

• References
• Source

• Patent Number

  2,180,683

• Date Filed

  Not available

• Date Issued

  Tuesday, November 21, 1939
  85 years ago

• CPC

  • G03B17/10 - Soundproof bodies

• US Classifications

  • 352 - Optics: motion pictures