# Relationship history for MSHA mine 1506793

Current hierarchy: **Cline Howard Jr → B & J Coal Company Inc → Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Collins Hoover & Buddy Sexton → Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ison & Trent Coal Company → Mine No 1; 1973-09-01 to 1976-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Ison Harry J & B J Trent → Mine No 1; 1973-09-01 to 1976-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Ison Harry J & B J Trent → Ison & Trent Coal Company; 1973-09-01 to 1976-09-27; source msha-controller-operator-history
- **operator_operates_mine:** B & H Coal Company → Mine No 1; 1976-09-28 to 1977-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Collins Hoover & Buddy Sexton → B & H Coal Company; 1976-09-28 to 1977-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Elwood Et Al → Mine No 1; 1976-11-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & J Coal Company Inc → Mine No 1; 1977-12-01 to 1980-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Elwood Et Al → T & J Coal Company Inc; 1977-12-01 to 1980-02-14; source msha-controller-operator-history
- **operator_operates_mine:** B & J Coal Company → Mine No 1; 1980-02-15 to 1981-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Robert M → Mine No 1; 1980-02-15 to 1981-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Robert M → B & J Coal Company; 1980-02-15 to 1981-03-23; source msha-controller-operator-history
- **operator_operates_mine:** B & J Coal Company Inc → Mine No 1; 1981-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cline Howard Jr → Mine No 1; 1981-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cline Howard Jr → B & J Coal Company Inc; 1981-03-24 to current/open; source msha-controller-operator-history