Well, the only source where I found the real translation of Diazed was the book I quoted above. The German term is clear, only the translation to English might be a bit questionable.
diametrally stepped two-piece Edison screw plug
diamatrally stepped refers to the fact the tips have different tip diameters, stepping up with the amperage to prevent overfusing.
Two-piece is easy, it's fuse insert and screw cap. Edison... wel, E27 or E14 thread.
And plug... well, in the old days any kind of cartridge fuse used to be called plug fuse.
That's my translation of the official explanation.
NH fuses are commonly referred to as HRC fuses in the English speaking world.
