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Dual crystal unit
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Piezoelectric crystal unit
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Perfume atomizer
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Oscillator frequency control
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Method and means for mounting piezo crystal plates
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Multiband superheterodyne radio receiver having a push-button station selector
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Multiband superheterodyne radio receiver having a push-button station selector
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Automatic agitator for apparatus subjecting liquid to electrical potential between electrodes
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Level indicating device for fluent materials
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Temperature responsive piezo-electric crystal oscillator
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Cavity resonator
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Temperature compensated crystal unit
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Holder for piezoelectric crystals and the like
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Crystal holder
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Method and means for processing piezoelectric crystals
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Method and means of finishing piezoelectric crystals
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Piezocrstal device of the sealed type
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End-loaded piezoelectric unit
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Piezoelectric device and method of manufacture
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Multiple crystal holder
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