Registro attestati

This term appears as a column heading in tables of patents in the Bollettino della proprietà intellettuale. Two number appear for each patent.

The full column heading is Numero del Registro Attestati, literally meaning Certificate Register Number or Attestation Register Number.

Interpretation as serial number: These numbers might be drawn from handwritten registers, books on which the newly requested patent filing would have been written by a clerk. In Sweden these would be numbered lines on a page and the written numbers would have legal and accounting significance insofar as one might need to look back at the register to see the earliest government record that the patent filing had occurred. This is a guess, but an educated one.

If so, we might combine the two three-digit numbers and interpret the resulting six-digit number as a Serial number, analogous to those in other countries, as I have experimentally done in this patent: Patent IT-1907-91820. We have little use for serial numbers except potentially to debug small questions of date and order of patent filing within a particular office. So we don't need to bother, but it would be possible

For more about the written patent tables, see Bollettino_della_proprietà_intellettuale#Interpreting_patent_tables