(October 17, 2016, 10:02 AM EDT) -- OKLAHOMA CITY — One of the defendants being sued in connection with injuries suffered by two workers when a lithium battery exploded during a hydraulic fracturing operation filed an answer and counterclaim in Oklahoma federal court on Oct. 14, contending that the plaintiffs fail to state a claim upon which relief can be granted and that it is entitled to immunity under the Oklahoma Workers’ Compensation Act (Jacob McGehee, et al. v. Southwest Electronic Energy Corporation, et al., and Southwest Electronic Energy Corporation v. Engineered Power LP, et al., No. 15-145, W.D. Okla.)....