Yes, but take one of the early extensions, just extending a -- an already granted patent to an inventor for an extra 10 years. How can that be squared with the language of the provision? Maybe Congress did it, but maybe it acted improperly when it did it.
An inventor got a ten year provision. 
A 10 yr provision (allowance) was granted on his patent. 
( z1 get :ARG0 ( z2 person :ARG0-of ( z3 invent ) ) :ARG1 ( z4 provision :duration ( z5 temporal-quantity :quant 10 :unit ( z6 year ) ) ) )