jcarlyle wrote:
This descriptor (TS 10.220/xx) is only used in DG and Stemme
flight manuals, as far as I can tell.

No. It's a LBA (the German FOCA) thing. I have no idea whether and how
this has changed with EASA.

In the mean time, I've learnt that the correct English name of the paper
is "Type Certificate Data Sheet (TCDS)", and the number is called
"Approval Number". If the device ist TSOed, then that TSO should be
found on that sheet.