Patent classifications
H
ELECTRICITY
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H03
ELECTRONIC CIRCUITRY
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H03G
CONTROL OF AMPLIFICATION
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1/00
Details of arrangements for controlling amplification
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H03G1/0005
Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
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H03G1/0035
using continuously variable impedance elements
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H03G1/0047
using photo-electric elements
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