Hill, Donald R. <br/><br/>
The book of knowledge of ingenious mechanical devices 
Donald R.Hill 
 - Islamabad  PHC,  1989. 
 -  xxxix, 285p. 
<br/><br/> Includes index 
<br/><br/><br/>Eng. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanical engineering
<br/><br/><label>Dewey Class. No.: </label>620.1  / HIB