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The oxygen panel above the third window on the left.

The valve at far left reads "Superior Valve & Fittings Co, Pittsburgh, PA."

The instrument second-from-left is a standard blinker/oxygen flow indicator.

The large instrument right of center is the "diluter demand oxygen regulator;" there's a lever to adjust between "normal oxygen" and "100% oxygen".

The two items at far right are not labelled, although the top one appears to be some sort of meter whose "off" portion of the gauge is at its bottom.