1221986

Information

• Patent Grant
• 1221986

• References
• Source

• Patent Number

  1,221,986

• Date Filed

  Not available

• Date Issued

  Tuesday, April 10, 1917
  107 years ago

• CPC

  • G04B1/225 - with the aid of an interposed power-accumulator (secondary spring) which is always tensioned

• US Classifications

  • 368 - Horology: time measuring systems or devices