01/2019 presentation American Association of Physics Teachers 2019 Winter Meeting
Publications
A Double-Layer Packaging Bag
Application Date 03/11/2016 Authorized Date 07/06/2017 The utility model discloses a double-layer packaging bag, including overlapping the inlayer wrapping bag and the outer wrapping bag of establishing, both ends of inlayer wrapping bag and outer wrapping bag all are equipped with and have the sealed end of tearing the tooth,… read more