Anh
crown optical glass
optical crown
optical crown glass
Đức
Crownglas
Kron optisches Glas
Kronglas
optisches Kronglas
Pháp
crown
verre crown
verre d'optique crown
crown,verre crown,verre d'optique crown /INDUSTRY,INDUSTRY-METAL/
[DE] Crownglas; Kron optisches Glas; Kronglas; optisches Kronglas
[EN] crown optical glass; optical crown; optical crown glass
[FR] crown; verre crown; verre d' optique crown