O-Nitro-o-azaarylidene photobleachable dyes and photographic ele
Offset printing plate
Oily mist resistant electret filter media
One bath type silver dye bleaching and silver bleaching
Optical dirty cell sensor for an electronic air cleaner
Organic heterocyclic and thioaryl phosphines in silver halide em
Organic medium for thin-phase holography
Organic volume phase holographic recording media comprising an .
Organic volume phase holographic recording media using sucrose b
Organotellurium (II) and (IV) compounds in heat-developable imag
Oxygen barrier layers for photopolymerizable elements
Oxygen barrier layers for photopolymerizable elements
Ozone enhancement unit
Ozone generators useful in automobiles