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.
Rolls Razor in the US in 1950; the claimed first use was 1922. The US patent for the method of attaching the blade to the handle was filed in 1925 and issued in 1930. The name "Rolls Razor (1927) Ltd." was used in advertising. The razor was still manufactured and sold until 1958 when the company was purchased by entrepreneur/corporate raider John Bloom who decided to focus on washing machines rather than the razor. Though not made by the Rolls-Royce company, the name was chosen to evoke the "Rolls" image of luxury and quality. The factory address was 255 Cricklewood Broadway, London,