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A cover is also provided including a marginal cover flange and a cavity, the cavity being formed by a raised...http://www.google.es/patents/US4577757?utm_source=gb-gplus-sharePatente US4577757 - Grooved base package B???squeda avanzada de patentes N???mero de publicaci???nUS4577757 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 06/642,470 Fecha de publicaci???n25 Mar 1986 Fecha de prese
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