| Identifier | Title | Date | Level of description | Other information | |
|---|---|---|---|---|---|
| GFA 1/1953 | Patente Stahlguss | 1899 – 1963 | File: 1 file | Standard period of protection | |
| GFA 1/1954 | Patente Stahlguss | 1959 – 1991 | File: 1 file | Standard period of protection | |
| GFA 1/1955 | Patente Stahlguss | 1957 – 1979 | File: 1 file | Standard period of protection |
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