Testing of discharge tubes (during manufacture H01J9/42)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Testing of discharge tubes

CPC: Testing of discharge tubes (during manufacture H01J9/42)

Full Title

Full titles differ between systems:

IPC:

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)

Of 2 combined children, 1 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1974.

Child Classifications

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G01R 31/245 CPC only CPC only
G01R 31/25 Testing of vacuum tubes since 1974 +3 CPC IPC+CPC Available in IPC and CPC