# Relationship history for MSHA mine 3606404

Current hierarchy: **Geist Ronald Jr-Ronald Sr & Gary → C & G Coal Company → No 1 Drift**

- 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:** Geist Ronald Jr-Ronald Sr & Gary → No 1 Drift; 1976-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & G Coal Company → No 1 Drift; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geist Ronald Jr-Ronald Sr & Gary → C & G Coal Company; 1977-05-01 to current/open; source msha-controller-operator-history