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Description Quartz Crystals, Umicore (Balzers), Alloy, 5 MHz, 10 crystals/disc Quartz Crystals, Umicore (Balzers), Gold, 5 MHz, 10 crystals/disc Quartz Crystals, Umicore (Balzers), Silver 5 MHz, 10 crystals/disc Quartz Crystals, Inficon and Satis, Alloy, ...