Many thanks, Nate and Dan

, for sharing your experience and impressions. And Franse, of course

OK, mainly & historically we produce stuff upon personal direct orders of middle/big studios & persons there/their colleagues & friends, as our main goal since oldest times, and for whom a marking of personal unit by symbols takes not main place vs performance in real use and sounding. And also, we make not big amount of orders (we`re small maker yet) upon of anyone who wish, with same quality and key features put into devices. Of course, the devices are conforming to standard IEC grounding scheme, e.g. -
http://papa-movie.com/VARIS_PSU_1111.jpg or
http://papa-movie.com/Velvet_PSU_2.jpg
except those few particular devices performed on demand, to avoid direct connection of device cases with steel racks and devices there, which were grounded through "true" ground, with metal plate in wet earth. "Dual" grounding, simultaneously through third pin and "true" earth grounding is prohibited, not mention for senselessness for such grounding, because of dirtyness of ground wire, with industrial hums and affecting onto grounding chains in result. On this reason, some techs remove ground pin in plugs/outlets or use other way to disconnect, if they use true grounding in earth.