26 Laboratory Porcelain Ware Consisting of Refractory Tubes and Vessels, Sampling Tubes, Pyrometer Tubes, Combustion Tubes, ((Crucibles, Combustion Boats, Evaporating Dishes, Casseroles, ))and Chemical Porcelain Ware
in a different form Jun. 10, 1938 in a different form Jun. 10, 1938 Applicant disclaims the exclusive right to the separate words "Sillimanite" and "Mullite" apart from the mark as shown. MULLITE