# Relationship history for MSHA mine 1516731

Current hierarchy: **Earl  Lawson; Bobby  Lawson → L & L Coal Company → 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:** Black Gem Mining Inc → No 1; 1989-09-01 to 1990-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Cornelius  Rowe → No 1; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornelius  Rowe → Black Gem Mining Inc; 1989-09-01 to 1990-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Puncheon Creek Coal Company Inc → No 1; 1990-10-09 to 1991-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Wolford Kyle → No 1; 1990-10-09 to 1991-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Wolford Kyle → Puncheon Creek Coal Company Inc; 1990-10-09 to 1991-10-09; source msha-controller-operator-history
- **operator_operates_mine:** T D Coal Company Inc → No 1; 1991-10-10 to 1996-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Bingham Ricky D & Timmy Sawyers → No 1; 1991-10-10 to 1996-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Bingham Ricky D & Timmy Sawyers → T D Coal Company Inc; 1991-10-10 to 1996-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Lawson et al → No 1; 1994-08-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & L Coal Company → No 1; 1996-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Lawson et al → L & L Coal Company; 1996-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Lawson et al → L & L Coal Company; 1996-01-16 to current/open; source msha-controller-operator-history