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Holzl, Werner; Haap, Wolfgang; Ochs, Dietmar; Puchtler, Karin; Schnyder, Marcel; Kulkarni, Surendra Umesh; Radhakrishna, Arakali Srinivasarao; Sawant, Mangesh Shivram; Mahtre, Asawari Bhikaji Patent: US2003/162836 A1, 2003 ;