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Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
503200000 HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD OF USE 162
503227000 HAVING PLURAL INTERACTIVE LEAVES 8

Patent applications in all subclasses Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor