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PCE
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DIFF Subgroup
G01R 31/25

Testing of vacuum tubes

Introduced: July 1974

Full Title

Full titles differ between systems:

IPC:

Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere > Testing of discharge tubes > Testing of vacuum tubes

CPC:

Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere ( testing line transmission systems H04B3/46; testing or measuring semiconductors or solid state devices during manufacture ) > Testing of discharge tubes (during manufacture H01J9/42) > Testing of vacuum tubes

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

Child Classifications

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