# Relationship history for MSHA mine 4703781

Current hierarchy: **Mathy Construction Company → Milestone Materials → Plant 22**

- 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:** Mathy Construction Company → Plant 22; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mary J  Opelt → Plant 22; 2004-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Opelt Sand & Gravel, LLC. → Plant 22; 2016-05-12 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Mary J  Opelt → Opelt Sand & Gravel, LLC.; 2016-05-12 to 2026-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Milestone Materials → Plant 22; 2026-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Milestone Materials; 2026-01-28 to current/open; source msha-controller-operator-history