# Relationship history for MSHA mine 1512860

Current hierarchy: **Smith Clifford → C M & S Coal Company Inc → Cm&S 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:** H & W Construction Company → Cm&S No 1; 1981-05-01 to 1982-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Hinkle James A & Harle Et Al → Cm&S No 1; 1981-05-01 to 1982-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Hinkle James A & Harle Et Al → H & W Construction Company; 1981-05-01 to 1982-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Smith Clifford → Cm&S No 1; 1981-08-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C M & S Coal Company Inc → Cm&S No 1; 1982-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Clifford → C M & S Coal Company Inc; 1982-03-05 to current/open; source msha-controller-operator-history