4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. At least one aryl ring which is part of a fused or bridged...

Robert G. Armbruster

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Pneumatic tire with tread of medium vinyl polybutadiene/rubber b

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...
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Sidewall and bead reinforcing structure for a pneumatic aircraft

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
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