# Relationship history for MSHA mine 0102075

Current hierarchy: **Lambert Troy--Wayne Kelly → M C Coal Company Inc → Andrews Pit 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:** M C Coal Company Inc → Andrews Pit No 1; 1979-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Troy--Wayne Kelly Et Al → Andrews Pit No 1; 1979-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Troy--Wayne Kelly Et Al → M C Coal Company Inc; 1979-05-01 to current/open; source msha-controller-operator-history