Letterbox, has bottom and frame with horizontal U-shaped slots with undercuts that receive terminal walls of panels and with vertical walls forming Z which arranges in vertical slots of panels

摘要

The letterbox has a base (2) and a top (3) with U-shaped slots on their front and rear edges. Lateral panels (4d, 4g) have vertical U-shaped slots on their front and rear edges. A bottom (5) and a frame (6) have horizontal U-shaped slots with undercuts that receive terminal walls of the panels and have two vertical walls at right angles, on their lateral edges for forming a Z which arranges in the vertical slots of the panels.