Identity boundary
Labels currently in scope
- 404
Evidence note: Straight-stitch 400-series comparison candidate with potential shared-part and non-shared-part evidence.
AUDITED CANDIDATE · QUEUE #18
Singer 404
This dossier also has a public research-cluster page. Publication records the evidence boundary; it does not confirm a shared mechanical platform or part compatibility.
Source audit
1 model-level source lead
- specialistDIRECT DOCUMENT
Singer 404-1 / 404-4 / 404-5 parts list, Form 21017
Exact multi-subclass parts document; controller and electrical variants are explicitly separate.
parts list · Covers: 404-1, 404-4, 404-5 · Checked 2026-09-07 · Link only
Free demand evidence
15 unique autocomplete leads
US / English snapshot collected 2026-09-07. This measures suggestion breadth only—not monthly search volume.
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6 suggestions · ok
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4 suggestions · ok
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8 suggestions · ok
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