sans-serif

Experimental sans serifs

Dear all,
There is a certain trend that I've noticed looking through design blogs, so called, experimental sans serifs. I noticed certain similarities in the glyphs of those typefaces and, although I can see some roots in scandinavian runes and art deco typography, I wonder where such distinct features that you can see in R's came from.
I would be grateful if anybody points my research in the right direction.

Sans-serif, narrow, geometrical, lo-case typeface from the masthead of an American 1946 magazine. Scanned.

Hello everyone,

I have attached a scan of the masthead. It reminded me of Wim Crouwel's 1957 Hiroshima poster but this was done almost a decade earlier. The letterforms seem to be drawn on a grid of a 7:2 ratio, if I am correct. Minimal counters and a very graphic, clean appearance.

Thanks in advance!

What Type foundry is this font from?

I became curious with this very neutral grotesque
looking at the sourcecode of the following site http://www.escola-aberta-rio.com/pt/#
i discovered that the font is called Mercator LB Regular, but i couldn' t find any font simillar to it in google, only a serifed from linotype that has nothing to do with it...
Radim Pesko is one of the teachers of the course of the site so maybe it is a guess...
Anyone have any idea where do i buy this font? Which Typefoundrie?
Thanks in advance...