George R. Brockway, 70, founder and president of a firm that represents companies selling forklift trucks, conveyer belts and other moving equipment to the government, died at his home in Washington Monday following a heart attack.

Mr. Brockway's 50 years in business was devoted to sales and marketing management. He was born in St. Louis, Mich., and grew up there and in Grand Rapids, Mich.

In 1928, he went to work as a salesman for the General Foods. Corp. He later worked for Standard Oil. In 1943, he became vice president for salws of the Rapid Standard Corp. in Grand Rapids. Subsequently he was vice president for sales of the Raymond Corp. in Greene, N.Y., and then president of Vac-U-Lift in Salem, Ill.

Mr. Brockway moved to Washington in 1961 and founded Sales Associates in the same year. The firm represents manufacturers of material-handling equipment, as it is called, in sales to the government. Mr. Brockway was president of the company.

In addition, he taught marketing management at Georgetown University and the American Management Association in New York.

He was a member of the board of directors of the National Capital chapter of the International Materials Management Society. He also served on the boards of directors of several companies, including the Kelly Co., College Services Inc., and Jefferds and Moore Inc.

Survivors include his wife, Marie R., of the home in Washington; a daughter, Sharon Brennan, of Springfield, Mass.; three sons, Brian, the dean of the College of Business and Economics at Lehigh University at Bethlehem, Pa., George M., a professor at the University of Wisconsin, Madison, Wis., and Mark, of the home; a brother, Don, of Orlando, Fla, and 12 grandchildren.