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M47 or M-47 may refer to:
M47 bomb, an American chemical/incendiary weapon
47th known Mersenne prime
M47 Dragon, an American anti-tank missile system
M-47 (Michigan highway), a state highway in Michigan
M47 Patton, an American main battle tank
BMW M47, diesel engine (1998-2007)
Messier 47, an open star cluster in the constellation Puppis
M47 A, maker's mark used by BSA (e.g.: No.7 bayonet)

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