3909820

Information

• Patent Grant
• 3909820

• References
• Source

• Patent Number

  3,909,820

• Date Filed

  Not available

• Date Issued

  Tuesday, September 30, 1975
  49 years ago

• CPC

  • G10K9/18 - Details
  • G10K1/065 - for timed or repeated operation

• US Classifications

  • 340 - Communications: electrical
  • 200 - Electricity: circuit makers and breakers
  • 368 - Horology: time measuring systems or devices