Harold N. Nathanson, an aluminum siding salesman who opened Aluminum Products, a home improvement business, died Tuesday of Parkinson's disease at the Gilchrist Center for Hospice Care. The Pikesville resident was 80.

Mr. Nathanson grew up in the Forest Park section of Baltimore and graduated from Forest Park High School in 1940. He earned several ribbons for his Army service in New Guinea during World War II as a member of the 126th Signal Service Company.

After returning to Baltimore, he sold aluminum siding and paper products until opening his home improvement business, Aluminum Products, on West Madison Street in 1954. An animal lover, he would bring food for the stray cats and dogs that lived behind the building.

He married Goldie Londer in 1952. The Nathansons raised their children in the Liberty Heights section of Baltimore before retiring to Florida in 1984. There, Mr. Nathanson was active in Temple Beth Shalom and published a newsletter, the Jewish Review. The Nathansons returned to the Baltimore area in August, moving to an apartment in Pikesville.

A history buff, Mr. Nathanson liked to take Sunday drives to area landmarks. He also kept a scrapbook of articles he wrote for local newspapers.

Services were held Friday.

In addition to his wife, Mr. Nathanson is survived by a daughter, Marsha Nathanson of Ellicott City; a son, Mitch Nathanson of Arnold; a brother, Henry Nathanson of Pikesville; and two grandchildren.