DE2726491
ACKERMANN, OTTO, MEYER, GUENTHER, LEUCK, HANS, SCHMELING, GERHARD, 5050 BRUEHL
Year of Publication 12.02.1981
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Year of Publication 12.02.1981
Patent
DE2726491
ACKERMANN, OTTO, MEYER, GUENTHER, LEUCK, HANS, SCHMELING, GERHARD, 5050 BRUEHL
Year of Publication 29.05.1980
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Year of Publication 29.05.1980
Patent