Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
Inventor
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Cyclic urea-formaldehyde prepolymer for use in phenol-formaldehy
Cyclic urea-formaldehyde prepolymer for use in...
Cyclic urea-formaldehyde prepolymer for use in...
Cyclic urea-formaldehyde prepolymer for use in...
Cyclic urea-formaldehyde prepolymer-modified...
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