There are several listing companies that are allowed to use in the US besides UL (US) and CSA (US) ETL and Farmer's Mutual (FM). As mentioned by others, a foreign listing company has to meet certain requirements.
First, if is a 50 hertz stove I'm sure it does not meet US standards. Appliance cords in the US are sold seperate so even though it has a NEMA config plug, it does not meet US standard.
And I seriously doubt and sensible inspector inspector would ok it although it is not covered by the NEC. the recept is, not the stove. It's up to the user to use it properly and liable for misuse. 50 hertz electronic circuits don't mix and I doubt the burners will put out like they normally would
