Petroleum and Energy
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324: German Patents Fulltext
325: Chinese Patents Fulltext
340: CLAIMS®/U.S. Patents
348: European Patents Fulltext
349: WIPO/PCT Patents Fulltext
351: Derwent World Patents Index®
353: Ei EnCompassPAT(TM)
652: U.S. Patents Fulltext (1971-1975)
654: U.S. Patents Fulltext (1976-present)

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