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.
Electric razor cord to drive a flywheel. Electric shavers fall into two main categories: foil or rotary-style. Users tend to prefer one or the other. Most rotary-style shavers are cordless—they are charged up with a plug charger or they are placed within a cleaning and charging unit. The first person to receive a patent for a razor powered by electricity was John F. O'Rouke with his US patent 616554 filed in 1898. Others followed suit, such as the American manufacturer Col. Jacob Schick who patented their first electric razor in 1930. The Remington Rand Corporation developed the electric razor further, first producing