This is currently too vague for me to make much sense of. On the one hand, I hearfrom Agent Proto's posts "industrial revolution" and/or "end of industrial revolution". This means basic factories and mass production, probably cars or whatever the logical alternative of cars are still considered in large part a luxury item, large rural areas, the emergence of "pollution", etc.
War equipment under such a level would be VERY primitive planes and tanks, a reliance on rifles, and anything approximating a machine gun pretty much requires either a fixed position or a tripod and crew. (for example)
On the other hand, in the war threads I am seeing things like jets, other more modern aircraft, nuclear weapons, microchip brain implants... I mean, at the end of the industrial revolution, there wouldn't even be vaccum tubes to put in peoples brains.
Not that there is anything inherently wrong with either scenario, I just think some guidlines and limits should be figured out.
(ed. The above reference to aircraft does not inlcude strictly and multi-era fantasy craft like airships.)