(May 10, 2017, 12:52 PM EDT) -- OKLAHOMA CITY — A company sued in connection with injuries suffered by two workers when a lithium battery exploded during a hydraulic fracturing operation filed an additional brief in Oklahoma federal court on May 5 contending that the plaintiffs cannot designate the company’s CEO as a specific witness under federal procedural rules (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.)....