Yehia, I. <br/><br/>
Affecting factors on performance of a developed hole digger  [electronic resource]. 
 العوامل المؤثرة على أداء حفار جور مطور. 

 - p.5575-5591. 
<br/><br/>Includes reference. 
<br/><br/> The aim of this research was the studying of some factors affecting the development of the hole digger. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drills (Planting machinery)<br/>Agricultural machinery--Economic aspects.<br/>Agricultural machinery industry.