4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. Polymers from only ethylenic monomers or processes of...

Toyo Contact Lens Company, Limited

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High toughness synthetic high polymers for soft contact lenses a

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
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Method of coloring water-absorbable plastics and colored water-a

Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
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