Single drum rollers 2019 1,482 h United States, Waterloo, Iowa
Single drum rollers 2024 27 h United States, Fort Dodge, Iowa
Single drum rollers 1992 United States, Baltimore, Maryland
Single drum rollers 2024 36 h United States, Fort Dodge, Iowa
Single drum rollers 2000 1,622 h Japan
Single drum rollers 1998 Portugal