Manufacture of a unique and very useful poultry feeder.  If you are having trouble with sparrows stealing your chicken's grain then this is the product for you as it only offers grain when chickens directly peck at the nozzle.  Mind you it is not entirely sparrow proof as sparrows in my back yard eventually learned to dive bomb the nozzle.  However it does deter them and my estimate is that it reduced my grain bill by 30%.