Mealey's (June 18, 2015, 10:21 AM EDT) -- PITTSBURGH — A hydraulic fracturing company being sued for allegations of breach of contract by an oil and gas field services company filed a brief in Pennsylvania federal court on March 20, contending that the court should deny the plaintiff’s request to depose a third corporate representative of the fracking company (ULC Oil and Gas Field Services v. EXCO Resources LLC, No. 14-00072, W.D. Pa.)....