Description
Class C03B : MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
Subclass 5/05: Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in tank furnaces Discontinuously-working tank furnaces, e.g. day tanks