Lots of info here :
but all in German .
However you can see that Büro-und Rechenmaschinenfabik in Liechtenstein did make cameras and lenses but not those that are discussed here.
So they came up with that Carena name for Porst and then Porst kept using it for stuff made by other manufacturers.
( I had no idea that cameras were ever made in Liechtenstein)
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www.vcalc.net
but all in German .
However you can see that Büro-und Rechenmaschinenfabik in Liechtenstein did make cameras and lenses but not those that are discussed here.
So they came up with that Carena name for Porst and then Porst kept using it for stuff made by other manufacturers.
( I had no idea that cameras were ever made in Liechtenstein)