72315675
Dec 18, 1968
Feb 9, 1971
ELEKTROPHYSIKALISCHE GESELLSCHAFT
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BALLS, ESPECIALLY STEEL BALLS, PROVIDED WITH SURFACES BEING HARDENED OR NITRIDED OR IMPROVED BY OTHER TREATMENTS, BALLS WITH SURFACES IMPROVED BY AN ELECTRIC GLOW DISCHARGE TREATMENT AND MINIATURE BALLS
BALLS FOR BALL BEARINGS AND OTHER BEARING DEVICES
BALLS FOR BALL POINT PENS