DescriptionCrystal Units Frequency Standard Oscillator XO VCXO OCXO TCXO Bell Labs AT&T Vectron.jpg
English: A collection of early quartz crystal frequency standard units used in crystal oscillators, produced by Bell Labs/AT&T/Vectron International. The crystals are visible as transparent rectangular flat plates within the glass bulbs, with rectangular metal electrodes plated on each side
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