'Glodex' Water Level Indicator, mounted behind gauge glass, on mahogany board. 1 spare gauge glass. By Bernon Walker Co., London, W2, England, 1925-1928. 'Glodex' Water Level Indicator 1925-1928
Two Tektor Minor level indicators, type M10/5H, circa 1958. Fielden level indicators type M10/5H circa 1958
