(March 30, 2020, 1:37 PM EDT) -- MILWAUKEE — A company that makes well plugs for hydraulic fracturing operators on March 6 sued its supplier in Wisconsin federal court, contending that the supplier breached the contract between the parties because the fiberglass material it sent to the well-plug manufacturer was faulty (Hydraulics International Inc. v. Amalga Composites Inc., No. 20-371, E.D. Wis.)....