# Relationship history for MSHA mine 0101757

Current hierarchy: **White Colonel Clayton T → Tuscaloosa Coal Processing Company → Prep Plant 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tuscaloosa Coal Processing Company → Prep Plant No 1; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Colonel Clayton T → Prep Plant No 1; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Colonel Clayton T → Tuscaloosa Coal Processing Company; 1977-07-01 to current/open; source msha-controller-operator-history