oops
now i have returned to your original diagram
& of course no oblique line is needed
since belu & lilu are clearly separated there
& indeed are already at right angles
so please forget the following nonsense
for i do completely agree with you now
> the only part i still dont get is your deduction that the belgian interprovincial boundary must run eastward from marker 75 along the road with the belu international boundary itself
etc
etc
etc
also
http://www.duprel.com/belluxm4.gif
may be a pretty fair historical diagram showing how bedelu moved in the 1920s
also
i thought mapquest interesting on this point
if not correct
for it rarely is correct on such details
but interestingly old bedelu looks like the same point as lun there
& yikes lilu crosses the road as an oblique line there too
but i dont really believe my eyes
m