Zale 12B-1 patent, tip WK-1

Zale 12B-1 patent, tip WK-1

Zale 12B-1 patent, Wippermann

Zale 12B-1 patent, Wippermann

Zale 12B-1 patent, tip WK-2

Zale 12B-1 patent, tip WK-2