1961-1962 Heil Trailers Engineering, Research, Testing and Production Sales Brochure. The front page has a business card for H. Lee Shafer stapled to it. The first couple of pages talk about the manufacturing plant with lots of pictures. There are pages that talk about their commercial and military production. The military stuff has some neat pictures like a Smoke Screen Generator, Self Lauching Combat Bridge and Combat Tank Hulls.