Word: biphenyls
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Dates: during 1938-1938
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...purity which can be maintained by ventilation and which will ensure freedom of the workers from possible injury. The simple compound, trichlornapthalene can be present up to 10 milksops per cubic meter of air without ill effects. The more complex compounds, tetrachlornaphthalene, pentachlornap thalene, hexachloranapthalene and chlorinated biphenyl, can be present at safely only to the extend of half a milligram per cubic meter...
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