Use wrenches the safe way. 

 - [Washington,  U.S. Govt. Print. Off.,  1951] 
 - 12 p.  illus.  23 cm. 
 - Its Bulletin,  no. 148 .
 - Bulletin (United States. Bureau of Labor Standards) ;  148. .
<br/><br/> Cover title. 
<br/><br/><label>LCCN: </label>l  51000160  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wrenches.<br/>Industrial accidents.
<br/><br/><label>LC Class. No.: </label>TJ1201.W8  / U5 1951 
<br/><br/><label>Dewey Class. No.: </label>331.823