# Relationship history for MSHA mine 0503515

Current hierarchy: **Coors Adolph Company → Coors Energy Company → Keenesburg Mine**

- 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

- **controller_controls_mine:** Coors Adolph Company → Keenesburg Mine; 1974-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coors Energy Company → Keenesburg Mine; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coors Adolph Company → Coors Energy Company; 1979-09-01 to current/open; source msha-controller-operator-history