1 May 2007 -- Neundorfer, Inc., which provides performance optimization services for electrostatic precipitators (ESPs) for air pollution control, has purchased APCO Services, Inc. APCO provides in situ and laboratory dust resistivity testing, physical scale gas flow modeling and gas flow distribution measurements. The acquisition of APCO enables Neundorfer to expand its range of particulate control services to include baghouse (or fabric filter) dust collection equipment and services in addition to performance and gas-flow modeling for both ESPs and baghouses.