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R21

R21, R-21 or R.21 may refer to:; In military. [1]

8 relations: Dichlorofluoromethane, HMAS Melbourne (R21), List of R-phrases, R-21 (missile), R21 (New York City Subway car), R21 road (South Africa), Renault 21, USS R-21 (SS-98).

Dichlorofluoromethane

Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon. It is a colorless and odorless gas. Its critical point is at 178.5 °C (451.7 K) and 5.17 MPa (51.7 bar). At temperatures from 5 K to 105 K it has one phase in the space group Pbca.

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HMAS Melbourne (R21)

HMAS Melbourne (R21) was a ''Majestic''-class light aircraft carrier of the Royal Australian Navy (RAN).

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List of R-phrases

R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations.

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R-21 (missile)

The R-21 (Р-21; NATO: SS-N-5 'Sark/Serb'; GRAU: 4K55) was a submarine-launched ballistic missile in service with the Soviet Union between 1963 and 1989.

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R21 (New York City Subway car)

The R21 was a New York City Subway car built by St. Louis Car Company in 1956-1957.

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R21 road (South Africa)

The R21 is a major north-south provincial route (with a freeway portion designated as a National Road) in eastern Gauteng Province, South Africa.

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Renault 21

The Renault 21 is a large family car produced by French automaker Renault between 1986 and 1994.

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USS R-21 (SS-98)

USS R-21 (SS-98) was an ''R''-class coastal and harbor defense submarine of the United States Navy.

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References

[1] https://en.wikipedia.org/wiki/R21

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