each nation will have a private sheet with all techs each tech and what it does will have a number of boxes to be checked. Some nations will have less boxes to check off.
Also the basic rules covering this will be written on the player aid card.
as i recall
Germany gets two rolls per turn, and Japan and Italy get one
USSR and UK get one roll each, and USA gets three
additional rolls (max of 1 extra per turn) costing 5 IPC are possible per player, except germany and usa can buy a max of 2 and 3 respectively.
The techs are:
Heavy tanks
Heavy Artillery
Jet fighters
Jet bombers
Heavy bombers
Atomic bomb
ASW (planes search- aerial sonar)
ASW (planes can attack in asw)
ASW ( all units locate and attack at 3)
super subs
plus more
plus a few others…