Real TD DW
While I have never used one of these interesting machines, if you look at the way it is built it looks like it would clean like hell. Yes this DW does have the square tubular H arm. The holes in the arms are like a MT RR DW, small so they give a really hi-pressure wash without throwing dishes and glasses around. The arms have a very unique self flushing design, on all four arm ends there is a 1/4" hole to allow large particles to flush out, but there is also a trapped SS ball that quickly seals this hole as the pump starts. This DW not only has a filter and a 1/3HP Gromen-Rupp pump which is what the first MT TL portable DWs had along with late 50s-early 60s WP DWs that worked so well.
All this coupled with a good heater that ran during wash and rinse cycles and a dual detergent dispenser I would expect this DW to do very well. The only weak thing is a filter that does not SC and the loading capacity may be limited because of the cut-out in the center of the lower rack, [ like a MT RR DW ].
I wish someone would get the machine and try it out, but if no one wants the complete machine I would love to get the control panel and front panels as ours are not in the best of shape.
This DW probably dates from around 1970.