Patent classifications
H
ELECTRICITY
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H03
ELECTRONIC CIRCUITRY
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H03F
AMPLIFIERS
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3/00
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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H03F3/20
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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H03F3/21
with semiconductor devices only
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H03F3/211
using a combination of several amplifiers
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