Ultrablack geometric sans on 50s-70s Hungarian Poster

This is off one of a series of industrial information posters from the communist era in Hungary that I bought in Budapest a few years ago. (The other posters have different typefaces, ranging from Gill Sans to Helvetica and a few more more-or-less interesting ones I can't identify, might post them later if there's interest.) The text reads: "do not touch the oxygen flasks with oily greasy hands". Design in Hungary was good but tended to change less with the times, therefore the very wide time range.

I've photographed, cropped, cleaned up and tried to straighten this as best I could, though it's still a bit warped. Whatthefont turns up nothing. Any ideas? Some of the letterforms are slightly awkward (especially the g) but overall I like it a lot.