Two leading tool and equipment makers, Stanley Works and Black & Decker, announced on Monday that they had agreed to merge in an all-stock transaction valued at about $4.5 billion.  Stanley is a diversified industrial company that sells hand tools and construction equipment, while Black & Decker is known for its power tools, and the combination would merge two companies whose product lines appear to go well together.  "Our lines complement each other," Black & Decker chief executive Nolan Archibald said in an interview.