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The sign on the F-1 engine. It reads

F-1 Engine

A cluster of five engines like this one provided the power for the first stage of the Saturn V launch vehicle during the Apollo-Saturn test flights, manned flights to the Moon, and the launch of the Skylab orbiting laboratory into Earth orbit. The engines were powered for 2-1/2 minutes lifting the Saturn V to an altitude of about 41 miles and a speed of about 6000 miles per hour. Each engine weighed 15,650 pounds and developed a thrust of 1,500,000 pounds.