Handrail for variable speed moving walkway
Hardening developers for silver halide photography
Hardening fixer for photographic silver halide material
Heat developable imaging materials and process
Heat developable light-sensitive diazotype materials and process
Heat developable light-sensitive material
Heat developable photographic material and process comprising tr
Heat development process utilizing a photosensitive composition
Heat sensitive dye layers comprising a benzopinacol
Hepa filter
High contrast continuous tone developer and process of use
High contrast, rapid access, air stable, regenerable iron chelat
High efficiency active electrostatic air filter and method...
High efficiency permanent air filter and method of manufacture
High efficiency permanent air filter and method of manufacture
High efficiency synthetic filter medium
High energy recording on an acetyl acetonate
High gain Co(III)complex imaging
High gain cobalt(III)complex composition and element
High molecular weight mercapto compound in color diffusion trans