On 13/12/2017 08:33, N_Cook wrote:
Like timing chains and toothed belts but for transfering positional info
rather than motive force plus timing.
So like the sprocket holes of Cine film or in this case more like the
central line of perforations in paper baudot tape. In this case thin
steel tape with central line of perforations, that engage with pulleys
with balls half set into drilled holes in the periphery of the pulleys,
same spacing, to engage with the holes ?

These sort of things
http://www.morinex.com/metalbelts.htm
but no generic term found there