Reid-Ashman Inc. completed the acquisition of Rome-Union Corp. of Scotts Valley, Calif., for an undisclosed amount of Reid-Ashman stock . . . Lear Siegler received a $19.7-million contract from General Electric for the manufacture of electromechanical components for propulsion systems . . . Todd Shipyards and Aro Corp. have signed a definitive agreement for Todd to acquire Aro . . . Recognition Equipment Inc. has completed the purchase of all outstanding stock of five marketing units of Mohawk Data Sciences Corp. in Europe for $22 million.