Flat tubular corner support structure for a ready-to-do box.
NL9102039A
Ready-made box with reinforced corner zones.
NL9000154A
Ready machine with double bottom.
NL8900889A
Reinforced tray cover.
NL8900888A
Strengthened box or cover made from sheet blank - is folded along four lines defining base with vertical wall ending in attachment flaps and intermediate panels adjacent base
