| Comparison : | 
									Item # QCH-3-1, QCH-3 Column, Chromatography, With Standard Joint Item # QCH-3-2, QCH-3 Column, Chromatography, With Standard Joint Item # QCH-3-3, QCH-3 Column, Chromatography, With Standard Joint Item # QCH-3-4, QCH-3 Column, Chromatography, With Standard Joint Item # QCH-3-5, QCH-3 Column, Chromatography, With Standard Joint
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