If I am not mistaken there have been some restrictions on cutting edge technology of the time (electronics, for instance) but I am not sure whether that has been implemented in practice, especially in Germany and Japan, but also in Italy.

Germany and Japan, though, got heavily de-industrialised and there was a conscious plan to bring the living standards to a much lower level than they used to be. Patents also got seized, and in general Germany and Austria did not recover their pre-WW2 prestige, even, for instance, in terms of the "new Heisenbergs and Schrödingers", which never came.

Encryption was heavily controlled for many years. Sanctions on medical technology also come to mind.