# Relationship history for MSHA mine 2500203

Current hierarchy: **Connell Howard → Farmers Sand & Gravel Inc → Ospray Lake**

- 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:** Whitney Sand & Gravel Inc → Ospray Lake; 1950-01-01 to 1984-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Roland C  Whitney → Ospray Lake; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland C  Whitney → Whitney Sand & Gravel Inc; 1950-01-01 to 1984-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Farmers Sand & Gravel Inc → Ospray Lake; 1984-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Connell Howard → Ospray Lake; 1984-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Connell Howard → Farmers Sand & Gravel Inc; 1984-06-14 to current/open; source msha-controller-operator-history