It was during World War II when William Vogelin was approached by an international, Minneapolis headquartered business, which was having an issue cutting photo emulsions. These were strobe apertures, timing disks, et cetera, on a glass substrate. Glass must be machined with water and water stained the emulsions. Mr. Vogelin was able to cut these parts and hold tight tolerances. And though his innovation used water as a coolant to cut the plates, his process kept the emulsions dry!