Lot of 3 Vintage Paper Filters FILTRAK
FILTRA ACIDO HYDROCHLORICO ET HYDROFLUORICO EXTRACTA 2x 390 1x 391
made in GDR
dicht, engporig, langsam filtrierend fur feinste Niedershlage
dense, narrov pores, slow-filtering for finest deposits
0,1mg
Diameter 18.5cm
nach TGL 9935
SPECIALPAPIERFABRIK NIEDERSCHLAG
des VEB Freiberger Zellstoff und Papierfabrik zu Weissenborn
Date of manufacture 80s
NEW in box, never used. some boxes may be slightly folded