# Relationship history for MSHA mine 0201726

Current hierarchy: **Ashland Inc → Tanner Companies → U M Plant 86**

- 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:** Tanner Companies → U M Plant 86; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** James E Carr Contractors Service → U M Plant 86; 1950-01-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Carr James E → U M Plant 86; 1950-01-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Carr James E → James E Carr Contractors Service; 1950-01-01 to 1985-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Tanner Companies → U M Plant 86; 1986-01-01 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Tanner Companies → Tanner Companies; 1986-01-01 to 1987-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Tanner Companies → U M Plant 86; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → U M Plant 86; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Tanner Companies; 1987-09-01 to current/open; source msha-controller-operator-history