That is a treat for members. The idea of remote air-cleaners was not knew, but their application to rotary lawnmowers in the 1950s certainly was. This patent recognises that.
This patent appears to deal with less the air-cleaner, and more with the 'snorkel' design itself. However, the restrictive aperture in the air-cleaner body seems to be an important feature of the design.
Thank you, again, for this great information, bestseller.