Baff, William E. <br/><br/>
Inventions: their development, purchase and sale 

 - New York  D. Van Nostrand Company  1920 
 - 230 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INVENTOS<br/>PATENTES
<br/><br/><label>Universal Decimal Class. No.: </label>A/347.77/B15