Mortensen, Otto <br/><br/>
Jens olsen's clock :  a technical description / 
Otto Mortensen 
 - Copenhagen :  Technological Institute,  1957 
 - 156 p. ;  29 cm. 
<br/><br/><label>ISBN: </label> Rs. 52.80 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Horology<br/>Clocks and watches
<br/><br/><label>Dewey Class. No.: </label>681.1