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The Rare Earths

Note 538 — Chapter XX · ARTIFICIAL SILK—ITS PRODUCTION AND USE IN THE MANTLE INDUSTRY

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A large number of patents are mentioned by Böhm, J. Gasbel. 1909, 52, 855.

[539] D. R. P. 188427, September, 1907; E. 15295, 1907.

[540] Vide E. 2240, 1908. Cerofirm Gesellschaft, by Brit. Cerofirm Co.

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