3131320

Information

• Patent Grant
• 3131320

• References
• Source

• Patent Number

  3,131,320

• Date Filed

  Not available

• Date Issued

  Tuesday, April 28, 1964
  60 years ago

• CPC

  • G04F5/063 - Constructional details
  • H03B5/34 - active element in amplifier being vacuum tube
  • H03H9/215 - consisting of quartz

• US Classifications

  • 310 - Electrical generator or motor structure
  • 084 - Music
  • 968 - Horology