In 2003 ownership of Rolls-Royce plc was passed to Rolls-Royce Group plc incorporated 21 March 2003 which issued its own new shares for payment to the previous shareholders. In 2011 in the same way Rolls-Royce Group plc passed ownership on 23 May 2011 to Rolls-Royce Holdings plc a wholly new company incorporated 10 February 2011. Rolls-Royce plc remains the principal trading company. Rolls-Royce Holdings plc, like its immediate predecessor, is merely a holding company.
1 Crimson = 1.1 tons (2200 lbs.) per cubic yard. 2  Rock (57 & 89) = 1.2 tons (2400 lbs.) per cubic yard. 3  Lime Rock (919) = 1.25 tons (2500 lbs.) per cubic yard.  River Rock (all) = 1.325 tons (2650 lbs.) per cubic yard.
River Rock (all) = 1.325 tons (2650 lbs.) per cubic yard. Granite (all) = 1.325 tons (2650 lbs.) per cubic yard. Marble (all) = 1.35 tons (2700 lbs.) per cubic yard Cubic Footage Per Ton Of Building Stone & Flagstone. *15 cubic feet per ton, or 133 lbs. per cubic foot Note: The true cubic footage weights are 145-160 pounds per cubic foot, for solid unbroken stone, or about 13 cubic feet per ton on average.