Radiation imagery chemistry: process, composition, or product th
Microcapsule, process, composition, or product
Inventor
active
Apparatus and method for signal separation and recording...
Diazo type recording material comprising two couplers wherein th
Diazo-type recording material comprising a 1-phenyl-3-pyrazolido
Heat development duplicating material comprising ascorbic acid
Heat development type diazo copying material containing a light
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