# Relationship history for MSHA mine 1516821

Current hierarchy: **Brewer Charles → B-F Enterprises Inc → Mine 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:** Harman Kendris (Ken) → Mine No 1; 1986-03-01 to 1992-05-18; source msha-controller-operator-history
- **controller_controls_mine:** James D  McIntyre → Mine No 1; 1988-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Billy Coal Company Inc → Mine No 1; 1990-02-01 to 1990-09-16; source msha-controller-operator-history
- **controller_controls_operator:** James D  McIntyre → Billy Coal Company Inc; 1990-02-01 to 1990-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Low Vein Coal Company Inc → Mine No 1; 1990-09-17 to 1992-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Harman Kendris (Ken) → Low Vein Coal Company Inc; 1990-09-17 to 1992-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Curtis Robert J → Mine No 1; 1992-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Curtis Coal Company Inc → Mine No 1; 1992-05-19 to 1993-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Curtis Robert J → Curtis Coal Company Inc; 1992-05-19 to 1993-02-23; source msha-controller-operator-history
- **operator_operates_mine:** B-F Enterprises Inc → Mine No 1; 1993-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brewer Charles → Mine No 1; 1993-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brewer Charles → B-F Enterprises Inc; 1993-02-24 to current/open; source msha-controller-operator-history