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Blueprint copy of a table entitled 'Comparative Data of Some Mixed Gas Furnaces'. Table comparing data relating to six different furnaces, these include:- 50 ton G.K.B 'D' fixed furnace (1941); 80 ton G.K.B. 'E' fixed furnace (1941); ST. U. Eus No.7 114 Ton tilter (1936); Wisconsin Steel 150 ton fixed furnace (1935); ST.U Eus No.8 143 ton tilter (1936); and 200 ton G.K.B tilter (1938).