# Relationship history for MSHA mine 4605168

Current hierarchy: **Neils William C → Energy Resources Mining Company Inc → Surface No 1**

- 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

- **controller_controls_mine:** Toler Olin E → Surface No 1; 1975-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marla Ann Coals Inc → Surface No 1; 1976-03-09 to 1977-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Toler Olin E → Marla Ann Coals Inc; 1976-03-09 to 1977-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Energy Resources Mining Company Inc → Surface No 1; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Neils William C → Surface No 1; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neils William C → Energy Resources Mining Company Inc; 1978-01-01 to current/open; source msha-controller-operator-history