VGKL 13 pages - Combustion tubes, combustion boats
Combustion Tubes, Quartz Glass, QGT Bad Harzburg
Quartz glass combustion tubes, Grote-Krekeler type, with 2 frits and 1 aperture plate.Without side tube stub.
Combustion Boats, Quartz Glass, QGT Bad Harzburg
Quartz glass combustion boats with or without handle, semi-circular.