| Wikidata property related to events | Q22964785 |
| Wikidata property related to law and justice | Q22984026 |
| P3254 | property proposal discussion | https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/29#P1840 |
| P2302 | property constraint | value-type constraint | Q21510865 |
| subject type constraint | Q21503250 | ||
| P2875 | property usage tracking category | Category:Pages using Wikidata property P1840 | Q26250088 |
| P1659 | related property | studied in | P2579 |
| principal investigator | P8329 | ||
| P2668 | stability of property value | values can be added | Q23611840 |
| Q171558 | accident | properties for this type | P1963 |
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