Does anyone know anything about an exercise machine Vita manufactured in Detroit by Knott and Garllus and patented in the 1920's?

The exercise machine you're referring to might be the Vita, which was indeed manufactured in Detroit by Knott and Garllus during the 1920s. This device was part of a trend in that era promoting physical fitness and home exercise equipment. The specifics of its design and functionality aren't widely documented, but it likely aimed to offer a convenient way for people to engage in physical activity at home. If you're looking for more detailed historical information, vintage fitness equipment collectors or archives might have more insights.