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 15 legacy relationships whose evidence mode is not classified.

Current receipt

Snapshot 549fc247aec531d49ac8464fe8717cc30becba333d0c34778c0e10f0159674bc

Catalog dc4b43241d67fa590c6e83fdff4fcf83829d32acc7e7116e424b636c786e9500

1,575 machines · 10,407 relationships · 461 official documents.