Marino Corsetti, 73, retired chief engineer for the National Broadcasting Co. here died Friday when a tractor tipped over and fell on him at his farm in Mitchellville, Md.

A native of Faleria, Italy, Mr. Corsetti came to this country here and began working as an electrical engineer, specializing in refrigeration. While working for the Fussell Young ice cream plant (now Arden Farms) he invented a process that increased the company's production. He jpined Nbc in 1957.

Mr. Corsetti, who lived in Washington also owned a farm in Mitchellville. Following his retirement in 1971, he spent much of his time working the farm's vegetable fields and vineyards.

During his career he received several patents for engineering inventions.

He was a member of Local 99 of the Union of Operating Engineers for 36 years.

Survivors includes his wife, Marguerite, of the homes in Washington and Michellville; three daughters, Anita Segreti of Bethesda, Marie Arient of Arlington and Antoinette Witt of San Diego, Calif.; a son, Harry J. of Falls Church; three brothers, Emilo, of Masontown, Pa., Emnauel, of Long Island, N.Y., and Roy, of Los Angels; six sisters, Mary Amling, of Seattle, Elizabeth Nettis, Josephine Vallini, and Sylvia Marconi, all of Cleveland, Anita Schue, of Chicago, and Helen Erjavec, of Las Vegas, Nev., and five grandchildren. CAPTION: Picture, MARINO CORSETTI