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Show Tin Rapidly Disappearing. With regard to the future use of tin, It may be said that we are dealing with the one metal whose known ore reserves are entirely inadequate to vjven the present demands and that unless un-less Eomc new source of supply is developed de-veloped very soon we may expect to tind that tin is a very scarce metal indeed Of the present sources of tin ore supply, says the Engineering Magazine, Maga-zine, most are .either stationary or receding re-ceding in output, Bolivia being the only one which gives promise of permanency perma-nency and of future growth. Under these conditions the question of substitute sub-stitute metals becomes of importance, md aluminum, zinc and steel all have some possibility In this direction In one way or another. |