# Relationship history for MSHA mine 3003238

Current hierarchy: **Edward E  Kading → Darling Sand & Gravel, Inc → Darling Sand & Gravel, Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Darling Sand & Gravel, Inc → Darling Sand & Gravel, Inc; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darling William C → Darling Sand & Gravel, Inc; 1998-09-01 to 2004-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Darling William C → Darling Sand & Gravel, Inc; 1998-09-01 to 2004-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Edward E  Kading et al → Darling Sand & Gravel, Inc; 2004-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward E  Kading et al → Darling Sand & Gravel, Inc; 2004-07-21 to current/open; source msha-controller-operator-history