3508350

Information

• Patent Grant
• 3508350

• References
• Source

• Patent Number

  3,508,350

• Date Filed

  Not available

• Date Issued

  Tuesday, April 28, 1970
  54 years ago

• CPC

  • G04B21/005 - Periodical acoustic signalling arrangements

• US Classifications

  • 434 - Education and demonstration
  • 368 - Horology: time measuring systems or devices
  • 446 - Amusement devices: toys
  • 968 - Horology
  • D19 - Office supplies