# Relationship history for MSHA mine 4702945

Current hierarchy: **Mathy Construction Company → Arthur Overgaard Division → Miller Stripping Operation (Portable)**

- 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

- **controller_controls_mine:** Mathy Construction Company → Miller Stripping Operation (Portable); 1984-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arthur Overgaard Division → Miller Stripping Operation (Portable); 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Arthur Overgaard Division; 1991-12-01 to current/open; source msha-controller-operator-history