# Relationship history for MSHA mine 0500780

Current hierarchy: **Beldon Enterprises Inc → Beldon Enterprises Inc → Enterprise Strip No 1**

- 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

- **operator_operates_mine:** B & D Coal Company → Enterprise Strip No 1; 1950-01-01 to 1971-09-01; source msha-controller-operator-history
- **controller_controls_mine:** B & D Coal Company → Enterprise Strip No 1; 1950-01-01 to 1971-09-01; source msha-controller-operator-history
- **controller_controls_operator:** B & D Coal Company → B & D Coal Company; 1950-01-01 to 1971-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Beldon Enterprises Inc → Enterprise Strip No 1; 1971-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beldon Enterprises Inc → Enterprise Strip No 1; 1971-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beldon Enterprises Inc → Beldon Enterprises Inc; 1971-09-02 to current/open; source msha-controller-operator-history