Phillips formed the Phillips Screw Company in 1934. The Pozidriv (sometimes incorrectly spelled "Pozidrive") is an improved version of the Phillips screw drive. Phillips Screw Company owns the name and produces the fasteners. A Phillips screw head is significantly different from a PoziDriv; see section below for details. The Phillips Screw Company offers both Phillips and Pozidriv combo heads with Robertson. In 1934, Henry F. Phillips introduced the Phillips screw and screwdriver to the market. Also, the Phillips screw slot is not as deep as the Reed and Prince slot.