Graf, Rudolf F. and Whalen, George J. <br/><br/>
How it works, illustrated  : everyday devices and mechanisms 

 - London  ; Popular Science  , 1974 
 - viii,182p. 
<br/><br/><label>ISBN: </label>0285621734  £4.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering<br/>Mechanical Engineering
<br/><br/><label>Dewey Class. No.: </label>621  / GRA