Michael Byrne kept one thought in mind when growing the manufacturing business he started in his Mansfield garage in 1966.According to Richland Source, Byrne Manufacturing will be expanding. The company, which primarily manufactures auger-boring machines used in underground tunneling, received unanimous approval for an enterprise zone agreement that will lead to the construction of a 10,000-square foot new building on the company's site near Mansfield Lahm Regional Airport.