US  2,717,879 <br/>
Recovery of treating solution. 

 -  Sep. 13, 1955 
<br/><br/> cl.252/1 
<br/><br/><label>Subjects--Local Terms: </label><br/>NAPHTHENIC ACID <br/>LUBRICATING OIL 
<br/><br/><label>Call Number: </label>US 2,717,879