7 Built-In Central Electric Vacuum Sweepers and Cleaners for Industrial Use, and for Injection Molding Equipment-Namely, Injection Blow Mold Manifolds, Accelerated Ejectors, Accelerated Knock-Outs, Counterbores, Power Operated Reamers, Power Operated Laps, Milling Cutters, Thread Roll Dies, Die Cases and Form Tools Used in Die Rolling