> Propane gas tanks became registered products

I still remember the two gentlemen in their black, faux leather jackets who rang our doorbell and demanded to see our dinghy. (dinghies where registered products too) We showed them our dinghy, they said thank you and left.

Probably someone fled over the Baltic sea to Denmark in a dinghy. So the secret police went from door to door until they found someone who could no longer show it to them...

This was in the late 80s.