SewGraph

Method & trust boundary

Evidence before answers.

SewGraph is built from immutable official OEM documents. Extraction can be automated; publication cannot outrun the exact native text supporting a claim.

1

Acquire

Store exact PDF bytes, source URL, issuer, retrieval metadata, and SHA-256 identity.

2

Extract

Inventory physical rows and native text. OCR can guide research but is never a terminal citation.

3

Promote

Schema-bound candidate claims must pass identity, scope, quote, page, and asset gates.

4

Publish

The site snapshot hides incomplete claims and never makes a catalog claim stronger.

Two evidence shapes

Direct and group-derived compatibility stay visibly different.

Direct OEM claim

The cited document names the exact machine and part relationship.

Two-hop OEM matrix

One cited row assigns the machine to an OEM group; another cited row says the part fits that group. Both quotes are mandatory.

Honest absence

Unknown is not incompatible.

If we have not found a supported answer, the page says unknown. An incompatible result appears only when official evidence explicitly supports that outcome.

Current release suppresses 17 legacy relationships whose evidence mode is not classified.

Current receipt

Snapshot a1cc1aceef228fcf33329e37165ab888ce5b9fe3f13eb56967ae0fbf41d8d8a7

Catalog e156281c7d3048027b5ac89e7476be8f54dd5a9309505e96260b0455d3cd2a7e

1,571 machines · 9,632 relationships · 496 official documents.