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Detail of the throat on the F-1 engine's No. 2 side.

At top is the heat exchanger; the four silver tubes are the helium and oxygen lines going to and from the heat exchanger. The "60" tube is just barely visible as a smudge at the extreme top of the throat.

Also, peeking out to the right of the right-most yellow support, is the engine's "master" ID plate.