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Mk 21

Wikimedia disambiguation page

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJul 23, 2024
Entity authorityQ112204608 ↗
Source-derived summary

Mark 21 or Mk XXI or variation, may refer to:

5"/38 MK 30, a variant of the 5-inch/38-caliber gun

Beaufighter Mark 21, a variant of the Bristol Beaufighter

Mk 21 (type 356), a variant of the Supermarine Spitfire (Griffon-powered variants)

Freighter Mk 21, a variant of the Bristol Freighter

Mk 21 Mod 0, a 7.62×51mm variant of the M1919 Browning machine gun

Mk.

Editorial summary

The public source identifies “Mk 21” as wikimedia disambiguation page. This brief keeps that definition visible, then builds a research path around Wikimedia, disambiguation and page.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current 63-word lead offers orientation but no explicit four-digit date, so chronology should not be assumed. The selected authority fields contribute no independent date. Its value is orientation rather than verdict, with Wikimedia, disambiguation and page providing the first useful test.
Editorial analysis

Why this record matters

A short description can identify a subject without explaining its stakes. For “Mk 21”, the useful work is to connect “wikimedia disambiguation page” to the records capable of establishing context and consequence.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 23, 2024. The linked authority identifier is Q112204608. None of the 0 selected statements returned an explicit reference.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Mk 21”, its source revision and the description used here.
  2. Expand the search: follow Mk 21 primary sources, Mk 21 archive and Wikimedia research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Mk 21”?
  2. Which institution is responsible for the underlying evidence?
  3. What terminology or title could unlock a more precise catalogue search?
Subject index

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Source & attribution

This entry incorporates text from “Mk 21” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.