# Relationship history for MSHA mine 4401902

Current hierarchy: **Smith Clement → Smith Coal Company → No 7 Mine**

- 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

- **operator_operates_mine:** Truman Hurt Coal Co → No 7 Mine; 1950-01-01 to 1974-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Hurt Truman → No 7 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurt Truman → Truman Hurt Coal Co; 1950-01-01 to 1974-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin & Sisk Coal Company → No 7 Mine; 1974-10-01 to 1975-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Baldwin & Sisk Coal Company → No 7 Mine; 1974-10-01 to 1975-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Baldwin & Sisk Coal Company → Baldwin & Sisk Coal Company; 1974-10-01 to 1975-03-01; source msha-controller-operator-history
- **operator_operates_mine:** M & S Coal Company → No 7 Mine; 1975-03-02 to 1975-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Sisk Buford → No 7 Mine; 1975-03-02 to 1975-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Sisk Buford → M & S Coal Company; 1975-03-02 to 1975-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Smith Coal Company → No 7 Mine; 1975-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Clement → No 7 Mine; 1975-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Clement → Smith Coal Company; 1975-08-20 to current/open; source msha-controller-operator-history