1221407

Information

• Patent Grant
• 1221407

• References
• Source

• Patent Number

  1,221,407

• Date Filed

  Not available

• Date Issued

  Tuesday, April 3, 1917
  108 years ago

• CPC

  • G03B17/10 - Soundproof bodies

• US Classifications

  • 352 - Optics: motion pictures
  • 464 - Rotary shafts, gudgeons, housings, and flexible couplings for rotary shafts