# Relationship history for MSHA mine 1515197

Current hierarchy: **Lawson Roy A → Four L Coal Company → #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:** Gray Letcher Et Al → #1; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Legra Coal Company Inc → #1; 1985-05-01 to 1986-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Gray Letcher Et Al → Legra Coal Company Inc; 1985-05-01 to 1986-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Flat Creek Coal Company → #1; 1986-07-23 to 1987-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Seay Joseph → #1; 1986-07-23 to 1987-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Seay Joseph → Flat Creek Coal Company; 1986-07-23 to 1987-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Flat Creek Coal Company → #1; 1987-08-17 to 1987-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Williams George E Et Al → #1; 1987-08-17 to 1987-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Williams George E Et Al → Flat Creek Coal Company; 1987-08-17 to 1987-11-18; source msha-controller-operator-history
- **operator_operates_mine:** B & G Coal Company → #1; 1987-11-19 to 1988-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Mc Vey Frank Et Al → #1; 1987-11-19 to 1988-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Mc Vey Frank Et Al → B & G Coal Company; 1987-11-19 to 1988-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Four L Coal Company → #1; 1988-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Roy A Et Al → #1; 1988-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Roy A Et Al → Four L Coal Company; 1988-03-04 to current/open; source msha-controller-operator-history