# Relationship history for MSHA mine 2500950

Current hierarchy: **Charles M  Miller → Miller Sand & Gravel Company → Miller Pit**

- 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

- **operator_operates_mine:** Sack Educational Fund → Miller Pit; 1980-02-01 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Sack Dean → Miller Pit; 1980-02-01 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Sack Dean → Sack Educational Fund; 1980-02-01 to 1983-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Miller Sand & Gravel Company → Miller Pit; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles M  Miller → Miller Pit; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles M  Miller → Miller Sand & Gravel Company; 1983-10-13 to current/open; source msha-controller-operator-history