G05F 3/22

Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only

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data.epo.org/linked-data/def/cpc/G05F3-22

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G05F 3/222

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Cooperative Patent Classification

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G05F 3/20

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