# Relationship history for MSHA mine 3605017

Current hierarchy: **Geist Ronald Sr → R & S Coal Company → No 1 Slope**

- 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:** A H A Coal Company → No 1 Slope; 1974-01-01 to 1975-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Hummel Paul → No 1 Slope; 1974-01-01 to 1975-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Hummel Paul → A H A Coal Company; 1974-01-01 to 1975-05-08; source msha-controller-operator-history
- **operator_operates_mine:** R & S Coal Company → No 1 Slope; 1975-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Geist Ronald Sr → No 1 Slope; 1975-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geist Ronald Sr → R & S Coal Company; 1975-05-09 to current/open; source msha-controller-operator-history