# Relationship history for MSHA mine 4602208

Current hierarchy: **Cassady Thomas → B C T Coal Company Inc → 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:** Davis Coal Company → No 1; 1971-02-01 to 1983-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Davis Winford → No 1; 1971-02-01 to 1983-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Davis Winford → Davis Coal Company; 1971-02-01 to 1983-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Smith Frank B → No 1; 1980-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ferguson Thad → No 1; 1983-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P A L Coal Inc → No 1; 1983-04-11 to 1986-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson Thad → P A L Coal Inc; 1983-04-11 to 1986-05-01; source msha-controller-operator-history
- **operator_operates_mine:** P A L Coal Inc → No 1; 1986-05-02 to 1986-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel F → No 1; 1986-05-02 to 1986-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel F → P A L Coal Inc; 1986-05-02 to 1986-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Energy Inc → No 1; 1986-06-23 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Smith Frank B → Eagle Energy Inc; 1986-06-23 to 1989-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Sales & Processing → No 1; 1989-09-01 to 1993-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Davis Winford → No 1; 1989-09-01 to 1993-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Davis Winford → Martin Sales & Processing; 1989-09-01 to 1993-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Alma Coal Company Inc → No 1; 1993-01-22 to 1993-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Cline Colin → No 1; 1993-01-22 to 1993-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Cline Colin → Alma Coal Company Inc; 1993-01-22 to 1993-07-13; source msha-controller-operator-history
- **operator_operates_mine:** B C T Coal Company Inc → No 1; 1993-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cassady Thomas → No 1; 1993-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cassady Thomas → B C T Coal Company Inc; 1993-07-14 to current/open; source msha-controller-operator-history