# Relationship history for MSHA mine 1515441

Current hierarchy: **Massey Energy Company → Stone Mining Company → Truck Garage**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Pittston Company → Truck Garage; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Coal Corp → Truck Garage; 1985-11-01 to 1993-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Eastern Coal Corp; 1985-11-01 to 1993-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Truck Garage; 1993-02-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stone Mining Company → Truck Garage; 1993-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Stone Mining Company; 1993-10-27 to current/open; source msha-controller-operator-history