These are Roto Operators, which allow the window to be opened by
rotating the handle.
These are a lot more common in the USA but you still find them now
and again, particularly in kitchens, where the windows are fitted with
fly screens.
If you see anything on this blog that you would like some more information
about, drop me a line on metalwindowparts@gmail.com
If
you see anything on this blog, that you think would help you out or you
have any questions and would like to speak to someone - please give us a
call.
We have readers from all over the world but we are UK based, in the East Midlands.
0116 2742195.
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