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HNLMS O 21

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Vehicle submarine Q1632246
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HNLMS O 21

Summary

HNLMS O 21 is a submarine[1]. It ranks in the top 9% of submarine entities by monthly Wikipedia readership (14 views/month).[2]

Key Facts

  • HNLMS O 21 is in the country of Netherlands[3].
  • HNLMS O 21's image is recorded as O 21 haven van Gribalter.jpg[4].
  • HNLMS O 21's instance of is recorded as submarine[5].
  • HNLMS O 21's Commons category is recorded as Hr.Ms. O 21 (submarine, 1940)[6].
  • HNLMS O 21's participated in conflict is recorded as World War II[7].
  • HNLMS O 21's Freebase ID is recorded as /m/0wdndl8[8].

Why It Matters

HNLMS O 21 ranks in the top 9% of submarine entities by monthly Wikipedia readership (14 views/month).[2]

Related Entities

Netherlands

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . Freebase Data Dumps. wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). HNLMS O 21. Retrieved May 3, 2026, from https://4ort.xyz/entity/hnlms-o-21
MLA “HNLMS O 21.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/hnlms-o-21.
BibTeX @misc{4ortxyz_hnlms-o-21_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{HNLMS O 21}}, year = {2026}, url = {https://4ort.xyz/entity/hnlms-o-21}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): HNLMS O 21 — https://4ort.xyz/entity/hnlms-o-21 (retrieved 2026-05-03)

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