(Portland, OR) -- Two law firms, one from Portland and one from Seattle, are merging. Portland's Miller Nash is uniting with Seattle's Graham & Dunn, to form the Miller Nash Graham & Dunn law firm. SeattlePI.com reports the combination will place 160 attorneys under one umbrella and form what's being described as a new Northwest powerhouse corporate law firm. The merger was approved yesterday by equity partners of both firms, and will become effective January 1st.