Mealey's (June 18, 2015, 3:29 PM EDT) -- PITTSBURGH — One of the defendants in a natural gas lease dispute on Nov. 23, 2014, filed a brief in Pennsylvania federal court contending that information which was inadvertently sent to the plaintiffs’ counsel by the gas company’s expert constitutes work product and the plaintiffs should be precluded from using it (Rugh A. Mason, et uxor v. Range Resources-Appalachia, et al., No. 12-369, W.D. Pa.)....