COMMERCIAL DOOR HANDING — DATASET EDITION 1.0.0
Documentation checked: September 14, 2026.

UTF-8 CSV files use JSON arrays inside cells for multivalued fields. The JSON distribution preserves native arrays.
Direct versus primary_excerpt tiers are evidence-depth distinctions, not product certifications.
Historical source dates are part of each record. No frequency of installed doors or ordering errors is measured.
The article carries the methodology, limitations and source register.
No manufacturer catalog, code book, artwork, or license to third-party materials is bundled.
