2791146

Information

• Patent Grant
• 2791146

• References
• Source

• Patent Number

  2,791,146

• Date Filed

  Not available

• Date Issued

  Tuesday, May 7, 1957
  67 years ago

• CPC

  • G04C21/12 - by electro-acoustic means

• US Classifications

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