I think I might have this! Clothes line is a "Hills Hoist" rotary clothes line - looks like the internal skeleton of a big square tent: -
https://hillshome.com.au/collections/hills-hoist-clotheslines. Mine can be removed from the ground, it is height adjustable by means of a winder, and rotates freely in the breeze, but can be lowered to a fixed position for the pegging out operation.
I have mine a fair way from the laundry (the only complaint) but my washing machine spins really fast, so the damp items aren't too heavy and in summer the clothes are dry before I get the last items in the basket onto the lines. When it's really windy, pegging out the sheets is like trying to hoist a spinnaker!