1438188

Information

• Patent Grant
• 1438188

• References
• Source

• Patent Number

  1,438,188

• Date Filed

  Not available

• Date Issued

  Tuesday, December 12, 1922
  102 years ago

• CPC

  • G04B31/016 - Plastic bearings

• US Classifications

  • 384 - Bearings
  • 501 - Compositions: ceramic
  • 968 - Horology