Evidence-backed verified
Waterbed
associated_period · stored direction: Waterbed → Twentieth-century modern era
The lexical first-use evidence does not establish the origin date of every water-filled sleeping technology.
MUSEUM / DOCUMENTED WINDOW
Twentieth-century modern era
A broad period node used cautiously for modern transforming and experimental bed forms; entity claims require their own evidence.
illustrative1 direct form association
PERIOD → FORM / DIRECT GRAPH EDGE
Documented form association
The stored edge direction remains form → period even though this page starts from the period for discovery.
MATERIAL / STYLE / MAKING CONTEXT
Branch from the associated form
These are current Bed Genome classifications. They are not automatically claims about the specific historical evidence example or about what originated in this period.
No current material/style/making classification for this form.
RELATED / DIRECT ATLAS EDGES
Continue without changing assertion status
Related edges remain evidence-backed or editorial-discovery exactly as stored.
PROVENANCE
Sources supporting this window
Period entity evidence and relationship evidence remain distinct even when they cite the same source.
- Beds Universe illustrativeBEDU001 model seed notes · reviewed 2026-09-09
- Merriam-Webster verifiedWaterbed — definition and word history · reviewed 2026-09-09
OBJECT CATALOG / PROVENANCE FIRST
Objects in this current evidence window
Each record is an individual museum/archive object with explicit date, form-link authority, holding, source provenance, and location semantics. Open the object catalog.
No current object record in this evidence window.