Wiktionary
ice resurfacer
n. A machine for smoothing the surface of an ice rink.
Wikipedia
Ice resurfacer
An ice resurfacer is a vehicle or hand-pushed device used to clean and smooth the surface of an ice sheet, usually in an ice rink. The two major manufacturers are Resurfice Corporation, which sells Olympia- brand machines, and Frank J. Zamboni & Company. The first ice resurfacer was developed by Frank Zamboni in 1949 in the city of Paramount, California. Zamboni is an internationally registered trademark.