# Relationship history for MSHA mine 4704004

Current hierarchy: **Robert P  Engel; Ronald Steven  Golat → Golat & Engel Custom Gravel Crushing Inc. → Golat & Engel Custom Gravel Crushing 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

- **controller_controls_mine:** Ronald Steven  Golat et al → Golat & Engel Custom Gravel Crushing Inc; 2015-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golat & Engel Custom Gravel Crushing Inc. → Golat & Engel Custom Gravel Crushing Inc; 2026-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald Steven  Golat et al → Golat & Engel Custom Gravel Crushing Inc.; 2026-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Engel et al → Golat & Engel Custom Gravel Crushing Inc.; 2026-08-17 to current/open; source msha-controller-operator-history