Concepts Alphabetical
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6 (Fensterglas ritzt schwer, Stahlfeile ritzt)
http://thesauri.dainst.org/_febe3059
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6-10 (durissimo, non scalfibile con lama di coltello)
http://thesauri.dainst.org/_f434ad9d
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http://thesauri.dainst.org/_436ece23
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http://thesauri.dainst.org/_72e01c71