# Relationship history for MSHA mine 4703723

Current hierarchy: **Mathy Construction Company → Milestone Materials Division of Mathy Construction → Plant 93**

- 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 93; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Milestone Materials Division of Mathy Construction → Plant 93; 2014-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Milestone Materials Division of Mathy Construction; 2014-06-13 to current/open; source msha-controller-operator-history