What does OSB stand for?

MLA style: "OSB." Acronym Finder . 2013. AcronymFinder.com 23 May. 2013 http://www.acronymfinder.com/Originally-Signed-By-(OSB).html
Chicago style: Acronym Finder . S.v. "OSB." Retrieved May 23 2013 from http://www.acronymfinder.com/Originally-Signed-By-(OSB).html
APA style: OSB. (n.d.) Acronym Finder. (2013). Retrieved May 23 2013 from http://www.acronymfinder.com/Originally-Signed-By-(OSB).html

Originally Signed By

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Optimization and Systems Biology (Symposium) Option Select Button Oracle Service Bus Order of Saint Benedict Order of Shepherds of Bethlehem Ordinis Sancti Benedicti (of the order of St Benedict) Oregon State Bar (Lake Oswego, Oregon) Oregon Symphonic Band (Portland, OR) Oriental Satellite Broadcasting Oriented Strand Board		Orquestra Sinfônica Brasileira (Portugese) Orthodox Study Bible Ortssippenbuch, Familienbuch or Ortsfamilienbuch (German) Osama Bin Laden Otentikk Street Brothers (musicians) Other Sports Beckon Output Signal Balance Over-Determined Sub-Band Overbrook School for the Blind (Philadelphia, PA) Overseas Service Bar