Razor be used on both sides, with two open edges. The blade on the double-edged safety razor is slightly curved to allow for a smoother and cleaner shave. In 1901, the American inventor King Camp Gillette, with the assistance of William Nickerson, patented a new variation of safety razor with disposable blades. Gillette realized that a profit could be made by selling an inexpensive razor with disposable blades. This has been called the razor and blades business model, and has become a very common practice for a wide variety of products. Many other brands of safety razors have come and gone.
Jacob Schick He officially retired from the military in 1910, but returned to duty from 1916-1918 as a Captain (eventually promoted to Lt. Colonel) due to the outbreak of World War I. Jacob Schick's first business venture, the Magazine Repeating Razor Co. (Founded 1925) sold a razor with injection cartridge blades designed much like a repeating rifle, where the blades were sold in clips that could be loaded into the razor without touching the blade. This business provided the necessary capital to develop his electric razor concept when he sold it to the American Chain & Cable Company in 1928. Successfully patented