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
A Blade in the Dark and neighbors are murdered by a razor-wielding slasher, and there is a weird next door neighbor who is a key suspect. Lamberto Bava was offered to direct "A Blade in the Dark" while he was assisting Dario Argento on "Tenebrae" (1982). The film was written by the husband and wife writing team of Dardano Sacchetti and Elisa Briganti. Bava and Sacchetti recalled that their collaboration was difficult, with the two being more friendly during the production of "Twitch of the Death Nerve" (1971), but their approach to this film was at odds with each other. The film was initially commissioned