# Relationship history for MSHA mine 1516723

Current hierarchy: **James River Coal Company → Bledsoe Coal Corp → No 6**

- 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:** Sunoco, Inc. → No 6; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Coal Company Inc → No 6; 1989-09-01 to 1995-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Shamrock Coal Company Inc; 1989-09-01 to 1995-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Williams Companies Inc → No 6; 1994-11-01 to 1997-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Bituminous-Laurel Mining Inc → No 6; 1995-01-09 to 1997-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Williams Companies Inc → Bituminous-Laurel Mining Inc; 1995-01-09 to 1997-01-01; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No 6; 1995-06-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bledsoe Coal Corp → No 6; 1997-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Bledsoe Coal Corp; 1997-01-02 to current/open; source msha-controller-operator-history