Gutmann, James L <br/><br/>
Origins of the Electronic Apex Locator - Achieving Success with Strict Adherence to Business.  [electronic resource] 

 -  Journal of the history of dentistry  2017 
 - 2-6 p.  digital 
<br/><br/> Publication Type: Historical Article; Journal Article 
<br/><br/><label>ISSN: </label>1089-6287 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dental Pulp Cavity<br/>History, 20th Century<br/>Odontometry<br/>Root Canal Preparation--history<br/>Root Canal Therapy--history<br/>Tooth Apex