| http://www.w3.org/ns/prov#value | - The primary problem being addressed by the inventors herein is provision of a sheet material for pre-formed, semi-rigid trays such as the try 2 seen in FIG. 2, and especially trays which are to be subjected to high thermal stresses, such as processing temperatures in the range up to about 121??? C. Such conditions are commonly encountered in the retort processing of such products as food and medic
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