Heidegger on technology: Ernst Junger wrote a couple of things in early 1939s that gave H. a lot of his ideas on Technology. EJ's "Worker" and "Total Mobilization" maybe.
Neither of the EJ works have been translated, and I haven't read them, but a few write-ups on the subject make it pretty clear. Translated volume of their correspondence was interesting, chummy, but somewhat disappointing. One or two essays they "exchanged" were better.
The way I read it, from an entirely personal and "non-philosophical" viewpoint, it's a bit hyperbolic; a useful and maybe call it metaphorical description.