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[ It but ] emphasizes the soundness of this Court 's early conclusion in Hall v. DeCuir , 95 U.S. 485 . In a case involving this responsibility , the Supreme Court of Nevada explained the background and purpose of the Public Service Commission Act of 1919 : [ It ] is the direct outgrowth of an urgent and persistent public demand for prompt , intelligent , and effective public control of public utilities . [ It ] allows , indeed encourages , students and teachers together to confront the real problems of their existence and relationships ... [ It ] " provides a comprehensive , subject specific guide to the history , uses , scientific principles , and technologies of espionage , intelligence , and security . [ It ] provides an extensive description of trust in relation to knowledge and information-intensive , knowledge-based activities within organizations , networks , and beyond . Verisign describes the X.509 certificate format : " [ It ] provides for certificate extensions , including standard extensions and private or community-defined extensions .