condenser box

condenser water box

continuous box girder with one box double cells

single box double room box girder

mirror condenser reflecting condenser

green box polices

+Control box

2-grade deceleration straight-tooth gear box

30m-defected precast box beam

3D packaging box CAD

3Dwing box

50 m box beam

50m simply supported box girder

50-m span box girder

56 meters long box beam

60 m precast concrete box girder

60m Long Box Beam

70 m Box Girder

a box and needle