Graf, Johannes, <br/><br/>
Modern times :  timekeeping on its way to the present / 
Johannes Graf. 
 - [First edition]. 
 - 39 pages :  color illustrations ;  21 cm 
<br/><br/><label>ISBN: </label>3922673198 9783922673194 
<br/><br/><label>LCCN: </label>2006485348 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches--History.<br/>Time measurements--History.<br/>Clocks and watches.<br/>Time measurements.
<br/><br/><label>Subjects--Index Terms: </label>Timekeeper (general) Germany Master slave timezones atomic quartz 20th century modern Catalog electrical electronic History 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>History.