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Crystals (electronic)|Electrical properties of materials|Electrical equipment|Layout|Waveforms|Approval testing|Inspection|Piezoelectric devices|Quartz|Performance|Qualification approval|Power measurement (electric)|Electronic equipment and components|Ordering|Acceptance (approval)|Specification (approval)|Oscillators|Crystal resonators|Ageing (materials)|Voltage|Assessed quality|Immersion tests (corrosion)|Electrical testing|Frequencies|Quality assurance systems|Detail specification