The two photographs below show the main equipment rack for Parkend Exchange assembled, but without the rack wiring, being built in my home garage. The small rack at the far end of the Parkend equipment was the small 1+9 strowger that served my home at the time.
The top shelf has final selectors and a test selector mounted on it. The shelf below has five group selectors and five spare positions. Below that are fifty line circuits, five line finders and space for five more. The linefinder is controlled from its associated group selector and is an integral part of the group selector circuit. The bottom shelf has the MDF, outgoing and bothway junction relay sets, a ring back relay set, a start distribution set and an S and Z pulse generator.
The equipment has come from a PABX4. It uses battery testing techniques in a similar way to a UAX13, but oddly, the testing and holding wire is designated H rather than the usual P.