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E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
E04H12/02—Structures made of specified materials
E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
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FR421790D1910-02-191910-10-24Procédé pour la fabrication de tubes de mats creux, etc.
ExpiredFR421790A
(fr)