1491223

Information

• Patent Grant
• 1491223

• References
• Source

• Patent Number

  1,491,223

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1924
  100 years ago

• CPC

  • G04C11/023 - provided with arrangements to prevent synchronisation by interfering signals
  • G04R20/20 - the radio signal being an AM/FM standard signal

• US Classifications

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