The Detroit Edge Tool Co. was founded 141 years ago on the shores of the Detroit River, where it manufactured and sharpened blades for the booming lumber industry of the 19th century. Now, the company’s products are used to create airplanes and other advanced, high-precision machinery. “We can thank our grandfather and our fathers for diversifying and not staying in one industry,” says John Ebbing Jr., vice president of Detroit Edge Tool and par…