Who is credited as being the inventor of the disposable/safety razor blade?

King Camp Gillette (January 5, 1855 - July 9, 1932) is credited as being the inventor of the razor blade.

Reared in Chicago, he was forced by his family’s loss of possessions in the fire of 1871 to go to work, so he became a traveling salesman of hardware. While honing a permanent straight-edge razor in 1895, Gillette had the idea of substituting a thin double-edged steel blade placed between two plates and held in place by a Τ handle. Instead of being sharpened, the removable blade would simply be thrown away once it became dull - an idea suggested by a co-worker to "keep the customer coming back". Gillette had no background in metallurgy, and manufacturing such a blade proved a challenge. It was some six years before William Nickerson developed a way to mass-produce the blades from sheet metal. The Gillette Safety Razor Company’s first sale, in 1903, consisted of a lot of 51 razors and 168 blades; by the end of 1904, it had produced 90,000 razors and 12,400,000 blades. Gillette’s innovative sales strategy—he sold the razors for a loss and made his profits on the blades—helped make the product a success.

Leo Hendrik Baekeland (November 14, 1863 - February 23, 1944) is credited as the inventor of Velox photographic paper and Bakelite plastic. The game of basketball was invented by James Naismith (6 November, 1861 - 28 November 1939), while Dr. John Stith Pemberton (8 July 1831 - 16 August 1888) invented Coca-Cola on May 8th, 1886 in Atlanta, Georgia.