1930's use of the turbine - yay!

Here is a youtube video.  Fast forward to 43 seconds. 

Yay! this still must be mostly out of patent. I think's there's a fellow in the south west of the England who patented in 87 - 89, and with 25 years from that date, his will timeout soon too.  It must be for some exceptionally fine grained difference to the base idea though as the video above is exactly the minima for the turbine (mounted hoziontally).