3 Del. C. § 2121: Exchanges between manufacturers.

Nothing in this chapter shall be construed to restrict or avoid sales or exchanges of commercial fertilizers or soil conditioners to each other by importers, manufacturers, or manipulators who mix fertilizer materials for sale or as preventing the free and unrestricted shipments of commercial fertilizer or soil conditioners to manufacturers or manipulators who have registered their brands as required by the provisions of this chapter.