External watch case with lens made of artificial crystal glass and the manufacturing method for the same

Bibliographische Detailangaben

1. Verfasser:	NG HOI SAN LOBY
Format:	Patent
Sprache:	eng
Schlagworte:	HOROLOGY MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL MECHANICALLY-DRIVEN CLOCKS OR WATCHES PHYSICS TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
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