# Relationship history for MSHA mine 4700903

Current hierarchy: **Mathy Construction Company → Milestone Materials → Plant 52**

- 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 52; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Opelt Brothers Inc → Plant 52; 1950-01-01 to 1996-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Gordon  Opelt → Plant 52; 1950-01-01 to 1996-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Gordon  Opelt → Opelt Brothers Inc; 1950-01-01 to 1996-11-06; source msha-controller-operator-history
- **operator_operates_mine:** G & S Trucking of Neillsville Inc. → Plant 52; 1996-11-07 to 2017-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Mary J  Opelt → Plant 52; 1996-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary J  Opelt → G & S Trucking of Neillsville Inc.; 1996-11-07 to 2017-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Mary J  Opelt → Plant 52; 2004-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Opelt Sand & Gravel → Plant 52; 2017-08-11 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Mary J  Opelt → Opelt Sand & Gravel; 2017-08-11 to 2026-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Milestone Materials → Plant 52; 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