Armentrout, Patricia,  1960- <br/><br/>
The pulley /  [book] 

 - Vero Beach, Fla. :  Rourke Press,  c1997. 
 - 24 p. :  col. ill. ;  26 cm. 
 - Simple devices .
 - Armentrout, Patricia,  1960-  Simple devices. .
<br/><br/> Includes index. 
<br/><br/> Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects. 
<br/><br/><label>ISBN: </label>1571031782 
<br/><br/><label>LCCN: </label>97015148  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pulleys<br/>Pulleys
<br/><br/><label>LC Class. No.: </label>TJ1103  / .A76 1997 
<br/><br/><label>Dewey Class. No.: </label>621.8 ARM