Spence, William,  b. 1815. <br/><br/>
A treatise on the principles relating to the specification of a patent for invention; showing the standard by which the sufficiency of that instrument is to be tried / 
by William Spence, ... 
 - London :  V. & R. Stevens and G.S. Norton,  1847. 
 - v, 188p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Patents--Great Britain.