# Relationship history for MSHA mine 0404535

Current hierarchy: **Shade Ed → E D S Inc → E D S Incorporated (Sand & Gravel)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** E D S Inc → E D S Incorporated (Sand & Gravel); 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shade Ed → E D S Incorporated (Sand & Gravel); 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shade Ed → E D S Inc; 1981-09-01 to current/open; source msha-controller-operator-history