4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. From aldehyde or derivative thereof as reactant

Sumio Ohta

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Process for polymerizing formaldehyde

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant
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Wiring board and method of producing wiring board

Semiconductor device manufacturing: process – Packaging or treatment of packaged semiconductor – Metallic housing or support
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Wiring substrate

Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
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