Global Industrial Vacuum Units Market By Type (Rotary Vane, Diaphragm, Liquid Ring, Venturi, Piston, and Turbomolecular), By Application (Analytical Field, Centralized Vacuum Plant, Construction, Environment, Food and Beverage, Gla, and Stone and Woods), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028