# Relationship history for MSHA mine 4604843

Current hierarchy: **C-M Resources → Clear Fork Coal Company Inc → Clear Fork 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:** Carroll Preston W → Clear Fork Strip; 1975-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clear Fork Coal Company Inc → Clear Fork Strip; 1975-10-01 to 1977-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Preston W → Clear Fork Coal Company Inc; 1975-10-01 to 1977-07-20; source msha-controller-operator-history
- **controller_controls_mine:** C-M Resources → Clear Fork Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clear Fork Coal Company Inc → Clear Fork Strip; 1977-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C-M Resources → Clear Fork Coal Company Inc; 1977-07-21 to current/open; source msha-controller-operator-history