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DIFF Subgroup
H03K 17/54

by the use, as active elements of vacuum tubes (using diodes H03K17/74)

Introduced: September 1968

Title

Titles differ between systems:

IPC: by the use, as active elements, of vacuum tubes

CPC: by the use, as active elements of vacuum tubes (using diodes H03K17/74)

Full Title

Full titles differ between systems:

IPC:

Electronic switching or gating, i.e. not by contact-making and -breaking > characterised by the use of specified components > by the use, as active elements, of vacuum tubes

CPC:

Electronic switching or gating, i.e. not by contact-making and –breaking (gated amplifiers H03F3/72; switching arrangements for exchange systems using static devices H04Q3/52) > characterised by the components used (H03K17/04 - H03K17/30, H03K17/94 take precedence) > by the use, as active elements of vacuum tubes (using diodes H03K17/74)

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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