Parents of a 9 year old boy are concerned about the appearance of front teeth. He is indulged in thumb sucking till date. Intraoral findings are flaring of maxillary and mandibular incisors , increased overjet ,anterior open bite and constricted maxillary arch. Who introduced the appliance that has been given to this child:

The Bluegrass appliance incorporates a modified, six-sided roller constructed to spin around a 0.045-inch stainless steel wire when rolled by the tongue. Haskell and Mink reported successful stoppage of thumb-sucking in children using the appliance with a program of positive reinforcement. The use of rakes and spurs in habit therapy has also been reported with success. Note: Bluegrass appliance is fixed intraoral anti- thumb sucking appliance and is placed for 3-6 months. Lingual Pearl was given by Ritto. Hotz has given the modification of oral screen. Baker has given the modification for Bluegrass appliance.