Stockl Vilem: Floor mat for animals. Rubberindustrie Vasto, October 24, 1972: US3699926 (67 worldwide citation)

A rubber or plastic floor mat for a stable, factory or the like, the major surfaces of which are provided with regularly distributed projections with a substantially circular or polygonal cross-section, the projections of one surface lying intermediately between the projections of the other surface, ...