Picker made a lot of those field x-ray units. In fact the whole history of Picker is very interesting ... as
this .pdf records.
"Our" field units were very similar to that shown at figure 14 (although the tube itself was more like the one shown at figure 12).
Here's a clear picture (which enlarges nicely) of the unit (but without the folding examination table). As I say, the tube was a simple fixed (stationary) anode type.
