Greetings all,  I'm investigating some of the more obscure European
reproducing piano systems and would like some assistance.  I'd like to
know the roll width and the tracker bar hole spacing on the roll for
the Pleyela, Stella and the different Philipps reproducing systems.

I know some of them are in the Encyclopedia of Mechanical Music, but
I need a sanity check.  I've found descriptions in different European
institutions which indicate some differences.

Measurement can be in inches or metric.

Thanks & stay safe,
John McClelland