# Relationship history for MSHA mine 2002709

Current hierarchy: **Ray  Oppenhuizen → Ensley Sand & Gravel Inc → ENSLEY SAND & GRAVEL, INC.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Ensley Sand & Gravel Inc → ENSLEY SAND & GRAVEL, INC.; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Oppenhuizen  et al → ENSLEY SAND & GRAVEL, INC.; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Oppenhuizen  et al → Ensley Sand & Gravel Inc; 1983-10-01 to current/open; source msha-controller-operator-history