Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
Representative
active
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(Benzofuran) naphthopyrans, the compositions and (co)polymer mat
2-adamantyl benzopyrans, the compositions and (co)polymer matric
Photochromic naphthopyrans, compositions and articles containing
Photochromic organic materials
Photochromic spiroxazines with asymmetric monocyclic substituent
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