国家/地区 中国（2）
IPC部 B（2）
IPC大类 B65（2） H05（2）
IPC小类 B65D（2）
IPC
发明人
公开年 2022（2）
申请年 2022（2）
专利权人

Degradable electronic packaging plastic tray comprises bottom of disc body is provided with two lower convex portions integrally formed with disc body, two of lower convex portions with concave pits connected with inner cavity of disc body, and disc body is provided with needle air holes.

WU F

Oil field oil tank graphene heating oil heater, has heating device comprising protective shell whose bottom is fixedly connected with bottom of inner wall of oil pipe cylinder, where inner part of shell is provided with movable column and plug.

DONG Y, LI J, ZHANG W