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		Dressing process control by acoustic emission (AE) sensors (3)
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		Touch detection between grinding wheel and work piece by acoustic emission (AE) and power sensor sensors (Gap & Crash) (2)
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		Touch detection between grinding wheel and work piece by acoustic emission (AE) sensors (Gap & Crash) (3)
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		Touch detection between grinding wheel and work piece by power sensors (Gap & Crash) (2)