# Relationship history for MSHA mine 1509866

Current hierarchy: **Massey Energy Company → Stone Mining Company → Pegs Branch No 30 Mine (A)**

- 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:** Pittston Company → Pegs Branch No 30 Mine (A); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Coal Corp → Pegs Branch No 30 Mine (A); 1976-08-05 to 1993-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Eastern Coal Corp; 1976-08-05 to 1993-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Stone Mining Company → Pegs Branch No 30 Mine (A); 1993-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Pegs Branch No 30 Mine (A); 1993-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Stone Mining Company; 1993-02-23 to current/open; source msha-controller-operator-history