H.sub.2 S indicator
Handle for plumbing fitting
Heat exchange and flow control system for series flow reactors
Heat exchanger for nuclear reactor installations
Heat insulating device for an engine exhaust system
Heat shield for a catalytic emission control device
Heat transfer element and tuyere for fluidized bed reactor
Heating device having dumbbell-shaped reaction tubes therein
Helium reclamation
Hemoglobin-oxygen equilibrium curve analyzer
HF Alkylation reaction temperature control system
High density lipoprotein cholesterol assay
High intensity, non-reversing humidity indicator
High temperature chemical reactor
High temperature chemical reactor
Highly sensitive gas measuring method for the analysis of breath
Holder device for sample vials or the like for an analysis appar
Holding device for laboratory ware
Honeycomb structure for countercurrent gas flow
Horizontal reactor for the vapor phase polymerization of monomer