Sampling methods
Electron tubes
Endurance testing
Quality control
Counting tubes
Visual inspection (testing)
Assessed quality
Indicator tubes
Electrical measurement
Aligned
Gas-filled tubes
Leakage currents
Approval testing
Electrical testing
Testing conditions
Gas-discharge tubes
Marking
Electronic equipment and components
Voltage measurement
Glow-discharge tubes
Specification (approval)
Current measurement
Quality assurance systems
Graphic characters
Inspection
Qualification approval
Performance testing
Cold-cathode tubes
Statistical quality control