# Relationship history for MSHA mine 1515714

Current hierarchy: **Blevins Nancy → B H & B Coal Company Inc → 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 H Coal Company → No 1; 1986-08-01 to 1987-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Blevins Kirk → No 1; 1986-08-01 to 1987-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Blevins Kirk → B H Coal Company; 1986-08-01 to 1987-07-19; source msha-controller-operator-history
- **operator_operates_mine:** High Point Coal Corp → No 1; 1987-07-20 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Gary D → No 1; 1987-07-20 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Gary D → High Point Coal Corp; 1987-07-20 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Jack → No 1; 1987-09-30 to 1992-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Rayon Mining Corp → No 1; 1988-02-24 to 1988-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Jack → Rayon Mining Corp; 1988-02-24 to 1988-09-12; source msha-controller-operator-history
- **operator_operates_mine:** B H & B Coal Company Inc → No 1; 1988-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blevins Nancy → No 1; 1988-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blevins Nancy → B H & B Coal Company Inc; 1988-09-13 to current/open; source msha-controller-operator-history