US Trademark Classification US21 Household and kitchen utensils 牛食槽（021-436） Class 21 牛食槽 021-436 Chinese 牛食槽 English Cattle troughs Spanish Comederos para ganado Term ID 021-436 Class 21 Type Goods Status Active · added, not since modified (A) Effective date 1991-04-02 Version 07-1997