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CPC Subgroup
H01J 19/70

Means for obtaining or maintaining the vacuum, e.g. by gettering

Full Title

Details of vacuum tubes of the types covered by group H01J21/00 > Means for obtaining or maintaining the vacuum, e.g. by gettering

1 direct subcode

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  • H01J 19/72 Tubulations therefor, e.g. for exhausting; Closures therefor