Crown moulding is now a one-person job! The Smithline Products, patented Crown Moulding Hanger is an easy to use, installation product for crown moulding. It is designed to make crown moulding installation easy for a single individual to do. This product was invented by a carpenter who saw the need to make crown moulding installation a one-person job. The Crown Moulding Hanger was developed, and is produced, in Canada.