DIFF Main Group
H01T 21/00 Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
Introduced: September 1968
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H01T 21/06 Adjustment of spark gaps (sparking-plugs having movable electrodes for adjusting the gap H01T13/26) since 1985 IPC+CPC Available in IPC and CPC