Clark F. Hannah, 78, a founder and former vice president of East Coast Stainless Steel Inc., died Oct. 3 at Holy Cross Hospital after an apparent heart attack.

A native of Freeport, III., he enlisted in the Army at the age of 16, seeing action in the Pershing expedition against Pancho Villa along the Mexican border. A member of the mounted engineers, he helped construct pontoon bridges for the crossing of the Rio Grande.

Leaving the Army in 1920, Mr. Hannah worked at jobs in Arizona and California, including that of salesman for Shell Oil and an assistant to the mayor of Santa Barbara, Calif., from 1939 to 1941.

Mr. Hannah served as a civilian operational officer at Port Hueneme, Calif., during World War II.

He moved to this area in 1946, and worked in public relations until and founding of East Coast Stainless Steel in 1959. The company is a local firm that markets cookware.

He is survived by his wife, Genevieve, and a daughter, Emily, both of the home in Silver Spring: three sisters, Evalyn Blaugh of Glendale, Calif., Mary Glen of Santa Barbara, Calif., and Jane Suelsman of Freeport, and two brothers, Jack E. and Richard, both of Freeport.