Below is DeVlieg's 1960 catalog for Type H Jigmil, a machine introduced during the late 1950s. Not only does it show the specification of the various models but also how they functioned and the accessory range. Type H Jigmils were the first to be offered with NC control in this case the TAPAC system. Further catalogs from the 1940/50s are here and ones from the late 1960s and 1970s will follow.  For an even fuller explanation of the principles behind the DeVlieg Jigmil - and how they were intended to be operated -  see the comprehensive data on the earlier Type B and the accompanying article here http://www.lathes.co.uk/devlieg