Patent laws. 

 - Washington  U. S. Govt. Print. Off. 
 - v.  23 cm. 
 - Ceased with issue for June 1979. 
 = Patent laws 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Patent laws and legislation--United States.<br/>Copyright--United States.<br/>Trademarks--United States.