Adsorbent trap for gas chromatography

Analyte pre-concentrator for gas chromatography

Analyte pre-concentrator for gas chromatography

Apparatus for gas chromatography

Chemical preconcentrator with integral thermal flow sensor

Chromatograph having a gas recycling system

Chromatographic stationary phases and adsorbents from hybrid org

Chromatography column assembly

Closing element intended for closing off an end of a capillary g

Closure systems for chromatographic columns

Compact thermal conductivity detector

Compliant column sheath assembly for gas chromatography

Concentrator apparatus for detecting trace organic components in

Contrasty light-sensitive silver halide material containing a hy

Cubic regular grain photographic reversal emulsions

Device for positioning and holding a length of gas...

Direct positive silver halide elements

Direct-positive silver halide emulsion fogged with a cyanoborohy

Direct-positive silver halide emulsions

Direct-positive silver halide emulsions