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Μια συσκευη οικονομικης καυσεως λιγνιτων και αλλων καυσιμων υλων, αποτελουμενη εξ' ενος λιγνιτοδοχειου η λιγνιτοθηκης, ιδιαιτερας κατασκευης και μιασκεκλιμενης εσχαρας.