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Priority to JP10288785UpriorityCriticalpatent/JPH0111720Y2/ja
Publication of JPS6211174UpublicationCriticalpatent/JPS6211174U/ja
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Publication of JPH0111720Y2publicationCriticalpatent/JPH0111720Y2/ja
Leak detector for checking sealing tightness of an object comprising a pumping device including a turbomolecular pump and first and second vacuum pumps having at least one first and second pumping stage wherein the outlet of the second vacuum pump is connected between pumping stages of the first vacuum pump