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Plastic clips, closures, latches and fasteners for closing and sealing boxes, cartons and containers; Plastic clips, closures, latches and fasteners for closing and sealing the flaps of cardboard, heavy duty board or corrugated board boxes, cartons and containers; Re-usable plastic clips, closures, latches and fasteners for closing and sealing boxes, cartons and containers; Re-usable plastic clips, closures, latches and fasteners for closing and sealing the flaps of cardboard, heavy duty board or corrugated board boxes, cartons and containers; Plastic locking attachments and locking fittings for locking clips, closures, latches and fasteners used in closing and sealing boxes, cartons and containers; Re-usable plastic locking attachments and locking fittings for locking re-usable clips, closures, latches and fasteners used in closing and sealing boxes, cartons and containers; Plastic clips, attachments, devices and fittings for use in the stacking of boxes, cartons and containers; Re-usable plastic clips, attachments, devices and fittings for use in the stacking of boxes, cartons and containers; Plastic and re-usable plastic clips, attachments, devices and fittings for use in the stacking of boxes, cartons and containers made from cardboard, heavy duty board or corrugated board; Plastic and re-usable plastic clips, attachments, devices and fittings for use in holding or maintaining open the flaps of cardboard, heavy duty board or corrugated board boxes, cartons and containers during the filling or packing or emptying thereof; Corner-mountable plastic or re-usable plastic clips, attachments, devices and fittings for use in the stacking of boxes, cartons and containers; Corner-mountable plastic or re-usable plastic clips, attachments, devices and fittings for supporting the walls and/or edges of boxes, cartons and containers during the stacking thereof