# Relationship history for MSHA mine 0101759

Current hierarchy: **Cotton David H → Vulcan Coal Sales Inc → Lost Creek Strip**

- 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:** Comeens Hillard → Lost Creek Strip; 1976-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & I Coal Company Inc → Lost Creek Strip; 1977-06-01 to 1977-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Comeens Hillard → C & I Coal Company Inc; 1977-06-01 to 1977-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Cotton David H → Lost Creek Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Coal Sales Inc → Lost Creek Strip; 1977-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cotton David H → Vulcan Coal Sales Inc; 1977-08-10 to current/open; source msha-controller-operator-history