I hope this makes sense...
if you look at 'underlined section' 2 the 'symbol' (I'm not saying it is, but is a better description) seems to be repeated above 'section 3'. The 'symbol' in section 1 seems to have a similar shape (albeit, slightly 'deformed') as 'section 2&3' . The 'symbol' above section 4 also has the 'elements' of symbol 2 but a little more spaced.
I may be seeing things that aren't there, ( saw Elvis walking his dog yesterday
) but there seems to be a recurring pattern on that section that does not look 'mechanical'.
I also have to point out I have no idea as to scale i.e. I have no idea of the dimensions of these marks.
I may be drawing BIG conclusions from very
little clues
Regards David