| Descriptors |
Circuits, Approval testing, Inspection, Marking, Quality control, Assessed quality, Sampling methods, Optical measurement, Electrical measurement, Voltage measurement, Qualification approval, Specification (approval), Electron tubes, Test equipment, Quality assurance systems, Light emission, Gas-filled tubes, Endurance testing, Electronic equipment and components, Performance testing, Testing conditions, Statistical quality control, Electrical testing, Arc-discharge tubes
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