# Relationship history for MSHA mine 1510343

Current hierarchy: **Knight Kem & Brett → Lst Inc → Clark Dock**

- 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:** Thomas E  Green → Clark Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Coal Company Inc → Clark Dock; 1977-04-01 to 1993-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Green → Green Coal Company Inc; 1977-04-01 to 1993-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Clark Earl → Clark Dock; 1993-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Coal Company Inc → Clark Dock; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Petro Union Inc → Clark Dock; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Petro Union Inc → Green Coal Company Inc; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Green Coal Company Inc → Clark Dock; 1994-08-11 to 1995-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Green → Green Coal Company Inc; 1994-08-11 to 1995-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Coal Recovery Systems Inc → Clark Dock; 1995-06-01 to 1996-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Clark Earl → Coal Recovery Systems Inc; 1995-06-01 to 1996-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Sisk John S & Gerlie V Rickard → Clark Dock; 1995-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ken-Coal Inc → Clark Dock; 1996-03-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Sisk John S & Gerlie V Rickard → Ken-Coal Inc; 1996-03-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Knight Kem & Brett → Clark Dock; 1998-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lst Inc → Clark Dock; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knight Kem & Brett → Lst Inc; 1999-09-01 to current/open; source msha-controller-operator-history