# Relationship history for MSHA mine 4606713

Current hierarchy: **Brock Mining Inc → Brock Mining Inc → A & B Thomas Mine #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Suffridge James S → A & B Thomas Mine #1; 1981-12-01 to 1991-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Westridge Coal Company Inc → A & B Thomas Mine #1; 1983-09-01 to 1991-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Suffridge James S → Westridge Coal Company Inc; 1983-09-01 to 1991-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Wrangler Mining Company Inc → A & B Thomas Mine #1; 1991-10-15 to 1992-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Crickenberger Walter → A & B Thomas Mine #1; 1991-10-15 to 1992-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Crickenberger Walter → Wrangler Mining Company Inc; 1991-10-15 to 1992-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Wrangler Mining Company Inc → A & B Thomas Mine #1; 1992-03-11 to 1993-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Sigler Walter W Et Al → A & B Thomas Mine #1; 1992-03-11 to 1993-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Sigler Walter W Et Al → Wrangler Mining Company Inc; 1992-03-11 to 1993-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Brock Mining Inc → A & B Thomas Mine #1; 1992-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Creek Smokeless Coal Company Inc → A & B Thomas Mine #1; 1993-08-15 to 1994-10-25; source msha-controller-operator-history
- **controller_controls_mine:** O'Dell Gordon E → A & B Thomas Mine #1; 1993-08-15 to 1996-03-24; source msha-controller-operator-history
- **controller_controls_operator:** O'Dell Gordon E → Laurel Creek Smokeless Coal Company Inc; 1993-08-15 to 1994-10-25; source msha-controller-operator-history
- **operator_operates_mine:** T-He Coal Company Inc → A & B Thomas Mine #1; 1994-10-26 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clung Harley D → A & B Thomas Mine #1; 1994-10-26 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clung Harley D → T-He Coal Company Inc; 1994-10-26 to 1995-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Creek Smokeless Coal Company Inc → A & B Thomas Mine #1; 1995-09-01 to 1996-03-24; source msha-controller-operator-history
- **controller_controls_operator:** O'Dell Gordon E → Laurel Creek Smokeless Coal Company Inc; 1995-09-01 to 1996-03-24; source msha-controller-operator-history
- **operator_operates_mine:** A & B Thomas Inc → A & B Thomas Mine #1; 1996-03-25 to 1998-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas William Eugene → A & B Thomas Mine #1; 1996-03-25 to 1998-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas William Eugene → A & B Thomas Inc; 1996-03-25 to 1998-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Brock Mining Inc → A & B Thomas Mine #1; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brock Mining Inc → Brock Mining Inc; 1998-06-01 to current/open; source msha-controller-operator-history