1638917

Information

• Patent Grant
• 1638917

• References
• Source

• Patent Number

  1,638,917

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1927
  97 years ago

• CPC

  • G04C3/021 - using mechanical coupling

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 968 - Horology