Unknown <br/><br/>
''Sentinel'' Valves and Accessories 

 - First 
 - ALLEY & MACLELLAN LTD  LONDON  1921 
 - 249p.  ill., fig., chart. 
<br/><br/><label>Nat. Bib. No.: </label>2283 
<br/><br/><label>Universal Decimal Class. No.: </label>05.621.311  / SEN