    Sentence 1: Abplanalp used  lastic' in a model that *’ could   mass-produced, __. lowering  the price. per valve  from 15 cents to 21/2 ¢ents..    Sentence 2: Mr.  ‘Abplanalp used plastic iri a model'that could  be mass produced , lowering ‘the price per  valve , to 21/2 cents from 15 cents.