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How Crystal Watch Works
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Impartial description describes how quartz crystals, quartz watches and quartz clocks work.
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A. and T. Trading Co.
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Manufacturer and exporter of quartz crystals, ceramic filters and resonators, and associated products.
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Roditi International
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Distributor of crystals for piezo-electric, laser and optical applications, components and processing and test equipment, located in London and Hamburg.
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