Cyrus Dolph patented and sold his safelock metal shingles, designed to be more reliable and water-tight than traditional shingles. They also required fewer repairs.
Related Stories
How Canada's IMAX went from a high-school lab to 1,000 theatres worldwide
Science teacher Gordon Clark gave three of his students the run of the high-school lab after hours in the 1940s, he would have had no idea that they would come up with one of the biggest innovations.