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Pole Zero Corporation
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Manufactures digitally tuned RF filters, notch filters, preselectors and low noise amplifiers.
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KR Electronics
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Designs and manufactures precision filters from dc to 3 GHz.
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Piezo Technology, Inc.
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A manufacturer of frequency control products such as crystal oscillators, crystal filters, lc filters, and crystal resonators.
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Curtis Industries
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Full line manufacturer of RFI filters - general purpose, high performance switching power supply, medical UL544, 3 phase, power entry modules.
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