| 21. | The relationship between otin that of sialon and silicon nitride is similar to that between brass and pure copper.
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| 22. | It decided on clad coinage, with copper nickel faces and a pure copper core, as the most desirable replacement material.
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| 23. | It is pure copper, Siegel says, and indeed it looks and feels like the copper in a freshly minted penny.
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| 24. | Although they were pure copper, removing the masses took a great deal of effort, and was sometimes not even profitable.
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| 25. | These coins were made of pure copper, which is very soft . Consequently, there are very few in existence today.
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| 26. | In terms of chemical composition, analysis of pure copper belonging to group of copper-bearing sandstone, indicates Kargaly as a possible source.
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| 27. | When the cells are electrified, the anodes slowly dissolve, freeing copper ions that are deposited on the cathode as 99.99-percent-pure copper.
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| 28. | Their weight in pure copper should be so close to the intrinsic value of the material that counterfeiting would be uneconomic.
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| 29. | He envisioned an ore body several thousand feet deep, some veins of almost pure copper and hundreds of millions of dollars.
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| 30. | There would be two coins of pure copper : a d�cimo de real and its half, legal tender to 2 reales.
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