David R Dickens, Waldo Smith, Herbert Malin: Floor mat construction. Teknor Apex Company, Salter & Michaelson, October 23, 1984: US04478901 (54 worldwide citation)

A floor mat construction of rubberized material including a base and feet of barbell-like configuration which extend integrally downwardly from the underside of the base for the support thereof in upwardly spaced relation on a supporting surface. A plurality of apertures the upper ends of which are ...