I've seen in a few places now a QBUS backplane that was apparently manufactured by the Measurex company. It's sometimes referred to as a Honeywell backplane, as Honeywell bought Measurex at some point.

The model is listed as a 053534-00 14x4 QBUS backplane. So far, I haven't found any sort of documentation at all.

Has anyone here seen these, or perhaps used one? Would they possibly work as a 22-bit backplane for a LSI PDP setup?