# Relationship history for MSHA mine 1515658

Current hierarchy: **Boyd Rocky → Chestnut Ridge Coal Company Inc → #3**

- 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:** Rogers K C → #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K C Rogers Coal Company Inc → #3; 1986-06-01 to 1992-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Rogers K C → K C Rogers Coal Company Inc; 1986-06-01 to 1992-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Stumbo Glenda & Jeff → #3; 1991-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mill Branch Coal Company Inc → #3; 1992-02-20 to 1993-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Stumbo Glenda & Jeff → Mill Branch Coal Company Inc; 1992-02-20 to 1993-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Mill Branch Coal Company Inc → #3; 1993-05-10 to 1995-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Curtis M & John G → #3; 1993-05-10 to 1995-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Curtis M & John G → Mill Branch Coal Company Inc; 1993-05-10 to 1995-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Boyd Rocky → #3; 1994-06-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chestnut Ridge Coal Company Inc → #3; 1995-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Rocky → Chestnut Ridge Coal Company Inc; 1995-01-17 to current/open; source msha-controller-operator-history