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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.