- Since 1946, LMB/Heeger has been manufacturing aluminum, plastic, die cast and drawn enclosures, including accessories, components, and hardware products. We're an American company using American know-how and materials to provide a superior product.  We're not the largest such company, but we constantly strive to be the best. All our products are backed up by years of experience in manufacturing and marketing both standard enclosures and customized fabrications. Experience the Heeger difference — better products for an affordable price. Give us a try! Your satisfaction is our number one goal.