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These forces can , in my opinion ( inaudible ) I think in most people 's , effectively undermine real substantive negotiations . Although the federal government can , in no possible view , be considered as a party to a compact made anterior to its existence , and by which it was , in fact , created ; yet as the creature of that compact , it must be bound by it , to its creators , the several states in the union , and the citizens thereof . Tin is used as a coating for steel cans , in solders for joining pipes or electrical conductors , and in bearing and other alloys for widely diversified applications . But ask how we can , in purely scientific terms , know the designer 's intentions ? The effects of using compulsory licenses appear to be limited because most developing countries and least-developed countries , in particular in Africa , do not yet have patent legislation in place and therefore copy production can , in principle , take place . The materials collected are : glass , plastic , and food cans , in the square container ; aluminum cans in the round container , and mixed office paper in the rectangular container .