# Relationship history for MSHA mine 4605786

Current hierarchy: **Dempsey Ronald B → New Start Coals Inc → No 1 Surface**

- 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:** Hercules Construction Company → No 1 Surface; 1978-04-01 to 1981-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Earl W → No 1 Surface; 1978-04-01 to 1981-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Earl W → Hercules Construction Company; 1978-04-01 to 1981-03-16; source msha-controller-operator-history
- **operator_operates_mine:** New Start Coals Inc → No 1 Surface; 1981-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dempsey Ronald B → No 1 Surface; 1981-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dempsey Ronald B → New Start Coals Inc; 1981-03-17 to current/open; source msha-controller-operator-history