71290733
Oct 7, 1929
May 19, 1931
ALPHA TANK & SHEET METAL MFG. CO.
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BOILER BREECHINGS; UNIT AIR HEATERS IN WHICH THE HEATING MEDIUM IS STEAM, COAL, GAS, OR OIL, SMOKESTACKS; WIND-ACTUATED ROOF VENTILATORS, AND VENTILATING DUCTS