The BMW M51 is an inline diesel engine produced by the upper austrian BMW plant in Steyr from July 1991 through February 2000.
The Eidgenössischer Stutzer 1851 (Federal Carbine 1851), also called Feldstutzer 1851, was the first service rifle used by the Swiss armed forces to be procured by the federal government, which was responsible for the armament of the Cantonal armed forces under the 1848 federal constitution.
The M 51 MACI and M 52 MACI (Mine Antichar Indétectable) are French circular minimum metal anti-tank blast mines.
M-51 is a north–south state trunkline highway in the southwestern portion of the US state of Michigan.
The M51 SLBM is a submarine-launched ballistic missile, built by Airbus Defence & Space, and deployed with the French Navy.
. Skysweeper (Gun, M51, Antiaircraft or Gun automatic, 75-mm T83E6, and E7, recoil mechanism, and loader rammer) was an anti-aircraft gun deployed in the early 1950s by both the U.S. Army and U.S. Air Force.
The Russian route R254 is a federal highway in Russia and Kazakhstan and is part of the Baikal Highway (which is part of the Trans-Siberian Highway).
The Sherman M-50 and the Sherman M-51, both often referred abroad as the Super Sherman, were modified versions of the American M4 Sherman tank that served with the Israel Defense Forces from the mid-1950s to early 1980s.
The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus.