| Identifier | Title | Date | Level of description | Other information | |
|---|---|---|---|---|---|
| GFA 41/139.1 | Piping Systems: plant Seewis, purity room | 1991 | Item: 1 photo | digitized | Protection period until: 2041 | |
| GFA 41/139.2 | Piping Systems: Use in waste incineration plants | 1993 | Item: 1 photo | digitized | Protection period until: 2043 |
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