Published June 16, 2011 Office products supplier W.B. Mason has signed a pair of two-year sponsorship deals with the Nationals and Orioles, expanding beyond its prior MLB pacts with the Yankees, Red Sox and Phillies. The deals come in tandem with a substantial new entry by the company into the DC-Baltimore market. Assets in the deals include outfield wall signage; suite access and tickets; and inventory on MASN, including title sponsorship of the clubs' respective postgame shows on the RSN. "Every market we've been in before where we've used baseball, it's shown itself to be a great selling tool, so we see big opportunity here, too," said Jeffrey Kirsch, W.B. Mason branch manager for Maryland, DC and Northern Virginia.