1977939

Information

• Patent Grant
• 1977939

• References
• Source

• Patent Number

  1,977,939

• Date Filed

  Not available

• Date Issued

  Tuesday, October 23, 1934
  90 years ago

• CPC

  • H03B11/06 - by mechanical interrupter
  • Y10T307/898 - Vibrating relay

• US Classifications

  • 363 - Electric power conversion systems
  • 084 - Music
  • 307 - Electrical transmission or interconnection systems
  • 310 - Electrical generator or motor structure
  • 318 - Electricity: motive power systems
  • 330 - Amplifiers
  • 331 - Oscillators