A lateral guidance and support apparatus for a shoe fixed at its front end on a cross-country ski. The apparatus includes a rib attached to the ski which is adapted to engage a groove in the sole of the shoe having substantially the same cross-sectional configuration and area as the rib. The rib and...http://www.google.fr/patents/US4789177?utm_source=gb-gplus-shareBrevet US4789177 - Three point support
