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Examples: Smart balance wheels and boards, like hoverboards, airboards and skateboards, self-balancing wheeled devices like Segways, battery-assisted bikes like e-bikes, motorbikes or motorcycles, electric powered scooters and Rideable or motorized suitcases." United also has specific rules for batteries

Journal of Pharmacology and Experimental Therapeutics

For example, workers in the top quartile for chronic occupational exposure to lead had a twofold risk of developing PD compared to those in the bottom quartile 78

for a summary of modern fatalities, Leonard Evans, Traffic Safety and the Driver (New York: Van Nostrand Reinhold, 1991), 3