# Relationship history for MSHA mine 1509344

Current hierarchy: **Oates Charles K → C & O Coal Company Inc → No 2 Mine**

- 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:** Corum A D → No 2 Mine; 1975-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wardlaw Mining Co → No 2 Mine; 1975-09-10 to 1976-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Wardlaw Mining Co → No 2 Mine; 1975-09-10 to 1976-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Wardlaw Mining Co → Wardlaw Mining Co; 1975-09-10 to 1976-04-13; source msha-controller-operator-history
- **operator_operates_mine:** C & O Coal Co Inc → No 2 Mine; 1976-04-14 to 1977-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Corum A D → C & O Coal Co Inc; 1976-04-14 to 1977-08-30; source msha-controller-operator-history
- **operator_operates_mine:** C & O Coal Company Inc → No 2 Mine; 1977-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oates Charles K → No 2 Mine; 1977-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oates Charles K → C & O Coal Company Inc; 1977-08-31 to current/open; source msha-controller-operator-history