00955cam a22002771 4500 l 29000081 DLC 20260227111532.0 800308s1929 sz a b 000 0 eng c l 29000081 (OCoLC)6062763 Library, U.S. Dept. of Labor NBuU DLC premarc HD4813 .I4 ser. F, 2d. sect., no. 3 International Labour Office. Hydro-extractors; their safe construction and equipment. Geneva [Printed by Atar] 1929. viii, 102 p. illus. 24 cm. Studies and reports, Series F, 2d section (Safety) no. 3 At head of title: International Labour Office. "Prepared by Mr. Massarelli, assisted by Mr. Scotti."--Pref. Bibliography: p. [92] Drying apparatus. Machinery Safety appliances. Massarelli, Francesco. 35942 35942