The logo on the front of the machine says Los Angeles....so I don't think it was made in China??
Anyway...you can purchase a manual here...
http://www.tias.com/173/PictPage/3923715750.html
and this site has some good info on the machine...evidentally it was made in the late 80's
http://www.worthpoint.com/worthopedi...e-case-not-221