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Priority to NL6504455ApriorityCriticalpatent/NL6504455A/xx
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H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
H01J41/06—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of cold cathodes