Arkady Grinblat: Universal exercising apparatus. Jacox & Meckstroth, December 1, 1987: US04709918 (134 worldwide citation)

An elongated base frame forms generally horizontal parallel tracks which support a pair of foot support platforms and carriages for independent longitudinal movement. A vertical column has a releasable pivot connection to one end of the base frame and supports a pair of arms for 360.degree. rotation ...