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A kind of Portable alarm based on GPRS signal framing
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A kind of Portable alarm of band camera function
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A kind of simple alarming signal projector
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A kind of terrestrial reference alarm with seismaesthesia detection
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A kind of short-distance wireless detector
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A kind of terrestrial reference alarm with control function
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A kind of Portable alarm with sound-recording function
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A kind of gas analyzing apparatus for restricted clearance
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