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Τελειοποιησεις του πολυγραφικου χαρτου (papier carbon) προς αποφυγην ρυπανσεως των δακτυλων και τωνδακτυλογραφημενων σελιδων, ως και προς αρτιωτερανεμφανισιν και συντηρησιν του εν λογω χαρτου.