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E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F17/00—Vertical ducts; Channels, e.g. for drainage
E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
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FR67597A1966-06-301966-06-30
Insulating brick for chimney with incorporated flue and set of prefabricated and assembled construction elements
ExpiredFR1485210A
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