Patent classifications
G
PHYSICS
Load children
G04
HOROLOGY
Load children
G04B
MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
Load children
39/00
Watch crystals; Fastening or sealing of crystals; Clock glasses
Load children Filter patents View analytics View as hierarchy
G04B39/004
from a material other than glass
Load children Filter patents View analytics View as hierarchy
G04B39/006
out of wear resistant material, e.g. sapphire
Filter patents View analytics View as hierarchy