Gibraltar Industries, Inc., Buffalo, NY, has acquired NorWesCo, Noll Manufacturing, and M & N Plastics from The Employee Ownership Holding Company. The companies, which have annual sales of $60 million, operate manufacturing facilities in Fife, WA; Portland, OR; and Stockton, CA.   ; They manufacture more than 4,000 products that serve the building, HVAC, and lawn and garden markets. They sell to retailers, building product distributors, roofing/concrete distributors, lumber yards, and contractors.   ; Gibraltar Industries is a manufacturer, processor, and distributor of products for the building, industrial, and vehicular markets. The company serves a variety of industries in the U.S. and throughout the world. It operates 89 facilities in 26 states, Canada, China, England, Germany, Mexico and Poland.