Manufactured from borosilicate glass 3.3. Conformed to DIN 12394 / DIN 12392. The side arms are parallel to each other.

Flasks round bottom, with two necks
NS jointed round bottom flasks, 2 necks
Flasks round bottom, with two necks
NS jointed round bottom flasks, 2 necks
Flasks round bottom, with two necks
NS jointed round bottom flasks, 2 necks
Flasks round bottom, with two necks
NS jointed round bottom flasks, 2 necks
Flasks round bottom, with two necks
NS jointed round bottom flasks, 2 necks