Daubitz, Paul.  <br/><br/>
The Complete Guide to Buying a Telephone System /  
Daubitz Paul. 
 - London :   Artech - House,   1985. 
 - VII, 152 s.;   22 cm. 
 - Proceedings SPIE .
 - Proceedings SPIE .
<br/><br/><label>ISBN: </label>0890062307