In addition to the vibrators operating with the traditional converters at 150-200 Hz, which can reach 4500 - 6000 - 9000 revolution per minute, have been realized special vibrators for operation with the modern electronical frequency regulators. These multitension and multifrequency vibrators operate which a centrifugal force ranging from 3000 to 9000 RPM. The vibrators of the series VEP/VEM building are suitable for the continuous use S1 and for 20 minutes of discontinuous use S2 under the heaviest conditions and in particularly humid or dusty environment They have all been projected. Constructed and thoroughly tested in the SOMAI works at Cisliano and are the fruit of long xperience in the development of technologically leading machines and modern tools.