# Relationship history for MSHA mine 1516890

Current hierarchy: **Browning John C → Browning Coal Company Inc → 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

- **controller_controls_mine:** Bill J  Collett et al → Strip No 1; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Browning John C → Strip No 1; 1989-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burco Mining Inc → Strip No 1; 1990-05-01 to 1991-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Bill J  Collett et al → Burco Mining Inc; 1990-05-01 to 1991-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Browning Coal Company Inc → Strip No 1; 1991-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Browning John C → Browning Coal Company Inc; 1991-04-02 to current/open; source msha-controller-operator-history