{HEAD ~ Polymer compositions} having attractive mechanical properties comprise linear alternating polymers of carbon monoxide and {TAIL ~ at least one ethylenically unsaturated hydrocarbon} and minor amounts, relative to the polymer, of glass fiber reinforcement and mica 
{ HEAD ~ Polymer compositions } having attractive mechanical properties comprise linear alternating polymers of carbon monoxide and { TAIL ~ at least one ethylenically unsaturated hydrocarbon } and minor amounts , relative to the polymer , of glass fiber reinforcement and mica
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