11/24/2023 0 Comments Isometric workout posters"The invention consists essentially in the novel construction and arrangement of parts whereby spring controlled telescopic members are embodied in an exercising apparatus in a special manner more particularly described hereinafter. It consisted of three sleeved, spring-loaded, telescopic cylinders in the center, with two hand grips affixed at the outermost ends. The device looked quite like the first bullworker to come (without strings). The original device was patented in 1912 by an American Citizen from Brooklyn, Arthur A.
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