Hi,
As far as I know they never did. Only in the 1950s with the rebuilt German Bundesheer and GeCo / RWS as supplier the sintox / sinoxid primer was reintroduced. I'm pretty sure the DDR just kept using corrosive primers afterwards.
Commercial non-corrosive primer brands can be found well before 1945, however, anything labeled nicorro, sinoxid or sintox should be ok.
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