1138991

Information

• Patent Grant
• 1138991

• References
• Source

• Patent Number

  1,138,991

• Date Filed

  Not available

• Date Issued

  Tuesday, May 11, 1915
  109 years ago

• CPC

  • G04C13/0463 - Arrangements for generating normal driving pulses

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 361 - Electricity: electrical systems and devices
  • 968 - Horology