A machine case includes a sink-like main portion and opposite deck stations by two ends of said main portion, and a terminal module. Said terminal module includes an insulator defining opposite top and bottom surfaces and a set of contacts retained to the insulator via a first insert molding process and arranged along a transverse direction. Each of said contacts is stamped and bent from sheet metal and unitarily formed with an upper contacting section and a lower contacting section. One of said upper contacting section and said lower contacting section defines an exposed end for originally linking to a contact carrier. The insulator forms a set of recesses originally formed between the contacting sections of neighboring contacts during the first insert molding while successively filled with material by the corresponding deck station in which said terminal module is embedded.