A copy of the Torpedo design was manufactured by Renak in the GDR (in fact on Sachs machinery),
and by Favorit in the CSSR. Favorit, in the Czech republic, still produces the design today,
though the quality is not original (but much better than standard singlespeed hubs).
Sachs is located in Schweinfurt, the home of the German bearing industry In 1943/44.
And then favorite design is also covered later in the copy by velostell in the Czech republic too.
So seen from the first sequence is the Torpedo - Favorites - Velostell. 
Tags: coaster brake, torpedo, favorit, fixie