this agreement cancels and supersedes all previous agreements of the parties relating to the subject matter covered herein
there are on other agreements or understandings,either oral or in writing , between the parties affecting this agreement or relating to the manufacture and supply by seller or the purchase by buyer of the products,except as otherwise specifically provided or referred to in this agreement
unless otherwise stipulated herein this agreement shall not be amended,altered,changed or modified in any manner, except by an instrument signed by duly authorized officer or representative of the parties be bound by such change