1520548

Information

• Patent Grant
• 1520548

• References
• Source

• Patent Number

  1,520,548

• Date Filed

  Not available

• Date Issued

  Tuesday, December 23, 1924
  100 years ago

• CPC

  • G04B1/185 - Friction clutch between spring and spring cylinder

• US Classifications

  • 185 - Motors: spring, weight, or animal powered
  • 968 - Horology