Frank L. Durr Orville N. Greene <br/><br/>
The Practical Inventors Hand Book 

 -  Mc Graw Hill Book New York  1979 
 - 246 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions
<br/><br/><label>Dewey Class. No.: </label>608.7  / DUR