Shaving Sword introduced the 'bonded blade' razor, which consisted of a single blade housed in a plastic cartridge. Gillette followed in 1971 with its Trac II cartridge razor that utilised two blades. Gillette built on this twin blade design for a time, introducing new razors with added features such as a pivoting head, lubricating strip, and spring-mounted blades until their 1998 launch of the triple-bladed Mach3 razor. Schick launched a four-blade Quattro razor later the same year, and in 2006 Gillette launched the five-blade Fusion. Since then, razors with six and seven blades have been introduced. Wholly disposable razors gained popularity
Union Metallic Cartridge Company the Crittenden & Tibbals Manufacturing Company of South Coventry, Connecticut, and from C.D. Leet of Springfield, Massachusetts, was moved to Bridgeport where ammunition production began as the Union Metallic Cartridge & Cap Company until the operation was incorporated as Union Metallic Cartridge Company in September 1867. A powder magazine on Success Hill was destroyed by explosion of 16 tons of gunpowder on 14 May 1906. No lives were lost, but damage was reported as far away as Long Island. In February 1909 UMC completed a shot tower which was the tallest building in Connecticut for many years. The red brick