The modified Hawley appliance: part I.
D004867:Equipment Design; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D009968:Orthodontic Appliances, Removable / Q000266:history*; D014087:Tooth Movement Techniques / Q000266:history / Q000295:instrumentation