Special lenses can see through black light (Phantom Lady.).
Soldiers have gas masks, with enough forethought, but then Germany lost their Russian campaign because forward planning assumed that their invading force would not need heavy coats because victory was supposed to be assured before it started snowing.
Once armies get their shit together, it wouldn't be too difficult to counter, but as far as pacifying towns and civilian resistance goes, they'd be totally screwed.
Skyman had a gravity belt, so the gravity rod tech was replicatiable to a degree, but really it was a really efficient solar battery that expended solar energy energy in a manner of different ways... Of course was there a reason it only worked with Starlight and not sun light?
What about Wonder Woman's invisible plane?
I remember in an All Star Squadron comic that had the invisible plane look like a transparent p-51 mustang, and Diana got huffy that Superman was running interferrance putting his puffed out chest between her plane's hull and NAZI incomming fire, becuase her plane was as bullet proof as he was.