Distillation apparatus for scientific purposes; Faraday rotator glass; Chromatographs for scientific or laboratory use; Chromatogram analyzers for scientific or laboratory use; Diaphragms for scientific apparatus; Repackaged columns for scientific purposes; Separation columns for scientific purposes; Vacuum probes for scientific use; Liquid chromatography injectors for scientific use; Liquid chromatography columns for scientific use; Degassing and debubbler apparatus and instruments for scien...