# Relationship history for MSHA mine 1202474

Current hierarchy: **The Heritage Group → Milestone Contractors, L.P. → Plant 42 M**

- 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:** Milestone Contractors, L.P. → Plant 42 M; 2016-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** The Heritage Group → Plant 42 M; 2016-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → Milestone Contractors, L.P.; 2016-05-31 to current/open; source msha-controller-operator-history