Ermert, Jürgen, <br/><br/>
Präzisionspendeluhren in Deutschland von 1730 bis 1940.  Observatorien, Astronomen, Zeitdienststellen und ihre Uhrenn /  1 : 
Jürgen Ermert. 
 - 603 pages :  illustrations ;  30 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches--History.--Germany<br/>Clocks and watches--Design and construction--History.--Germany<br/>Clock and watch making--History.--Germany
<br/><br/><label>Subjects--Index Terms: </label>Clock (general) Germany Highgrade precision   clock movement pendulum advanced History