1. A licensed wholesale dealer who sells and, at the time of such sale, delivers merchandise to retail merchants;

2. A distributor or vendor of motor fuels and petroleum products;

3. A distributor or vendor of seafood who catches seafood and sells only the seafood caught by him;

4. A farmer or producer of agricultural products who sells only the farm or agricultural products produced or grown by him;

5. A farmers’ cooperative association;

6. A manufacturer who is subject to Virginia tax on intangible personal property who peddles at wholesale, only the goods, wares or merchandise manufactured by him at a plant, whose intangible personal property is taxed by this Commonwealth.