A testing service/ 
Electrical Testing Laboratoris, New york 
 - New York:  Electrical testing Laboratories,  [19--] 
 - 25 p.:  ill.;  15 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric testing<br/>Electric measurements--Instruments<br/>Electric apparatus and appliances
<br/><br/><label>Dewey Class. No.: </label>621.37072