(8 hours ago)N. W. Perry Wrote: Agreed, though I'm not aware of a proposal to incorporate any Jumbo bricks into the Mursten category anyhow.I'm the only one who mentioned Jumbo and Kiddybrick; specifically to exclude them from Mursten although they precede the "stud and tube" patent. My point was to not include everything prior to "stud and tube" as Mursten.
Since there is no clear transition from "Mursten" to "System", I see no problem with some brick plates having tubes labeled as Mursten. I would consider it more from longevity of the part into the "System" era. Those parts that didn't make it a long time (i.e. not present in this century), can be labeled as Mursten.
The logos (both top and bottom) should not matter as they don't affect the connectivity in any way. These are extremely rare pieces nowadays and few would actually use CAD software to design complex builds with them. They seem to be more of a collectors' curiosity. Granted, some collectors accrue historically accurate LDraw files, but there is no reason why those must be part of the official library. The library permits them if submitted and they pass the reviewing process.