3691752

Information

• Patent Grant
• 3691752

• References
• Source

• Patent Number

  3,691,752

• Date Filed

  Not available

• Date Issued

  Tuesday, September 19, 1972
  52 years ago

• CPC

  • G04C21/28 - by closing a contact to put into action electro-acoustic means
  • G04B19/202 - by means of turning discs

• US Classifications

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