The Rosedale ROC post has a good complete set of surface features.
The circular metal plate on the main hatch is a mount for a Ground Zero Indicator (GZI) which was an arrangement of 4 pinhole cameras to indicate the direction of nuclear blasts. The metal pipe emerging from the side would have connected to the hand pump at the bottom of the shaft.
A louvered air vent is located at each end, one is part of the main hatch the other standing alone.
The large metal post is a Radiac mount which would hold equipment to measure radioactivity levels.
The smaller metal post is part of a Bomb Power Indicator (BPI) which was connected to a gauge underground to measure the pressure or shockwave from the blast.