US Trademark Classification US21 Household and kitchen utensils 猪食槽（021-153） Class 21 猪食槽 021-153 Chinese 猪食槽 English Pig troughs Spanish comederos para cerdos Term ID 021-153 Class 21 Type Goods Status Active · added, not since modified (A) Effective date 1991-04-02 Version 07-1997