Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R9/00—Instruments employing mechanical resonance
  • G01R9/04—Instruments employing mechanical resonance using vibrating reeds, e.g. for measuring frequency
  • G01R9/08—Instruments employing mechanical resonance using vibrating reeds, e.g. for measuring frequency piezoelectrically driven
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J17/00—Gas-filled discharge tubes with solid cathode
  • H01J17/02—Details
  • H01J17/34—One or more circuit elements structurally associated with the tube
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
  • H01J19/78—One or more circuit elements structurally associated with the tube
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03F—AMPLIFIERS
  • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
  • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03F—AMPLIFIERS
  • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
  • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03F—AMPLIFIERS
  • H03F99/00—Subject matter not provided for in other groups of this subclass

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Amplifiers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22799556

Family Applications (1)

Country Status (3)

• 0
  • BE BE353651D patent/BE353651A/xx unknown
• 1928
  • 1928-07-30 FR FR658399D patent/FR658399A/fr not_active Expired
  • 1928-08-15 GB GB23523/28A patent/GB295997A/en not_active Expired

Also Published As

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