In 1973 there were 18 Deering Ice Cream Shops in Maine and New Hampshire. Hamburgers rose in price from 55 to 65 cents. At the time (1973) wholesale hamburger went up from 89 cents to $1.15 per pound.
In December 1997, Fieldbrook Farms acquired the assets of Portland, Maine based Deering Ice Cream, which was founded in 1886, bringing with it the Howard Johnson brand ice cream rights. Fieldbrook Farms is the trade name of Fieldbrook Foods Corporation, a $100 million manufacturer of private label ice cream and frozen desserts based out of Dunkirk, New York. (Wikipedia)
The 107-year-old Deering Ice Cream Corp., which was sold to the above investor group by Andrew Stickney, 42, who had bought the company from his father in 1990. Here is the obit of Andrew's father, in 2011.
Access a long article on Deering via: http://digitalcommons.portlandlibrary.com/news_pph/406/