SOMERVILLE, Mass.--(BUSINESS WIRE)--For the last century, Grossman Marketing Group developed a reputation for its expertise in assisting their clients' with their marketing initiatives. Today, Grossman Marketing Group takes another step in their efforts to further expand their New England footprint as they announce the acquisition of New Hampshire-based Symbol Marketing & Promotions. The purchase of Symbol Marketing & Promotions expands Grossman Marketing Group's deep relationships in t