Second annual report of the controller general of patents, designs & trade marks under section 155 of the patents act ,1970(39 of 1970) for year 1973-74 

 - s.l  s.n.            1974 
 - 20-p.  A-p-p.: 7-20-p  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Z2,2673.N74<---N73r, L4