# Relationship history for MSHA mine 4605017

Current hierarchy: **Addair Wayne & Darrell → Little Darrell Coal Company → No 1 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:** Massey Energy Company → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Phillips Coal Company Inc → No 1 Mine; 1976-01-07 to 1976-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Robinson-Phillips Coal Company Inc; 1976-01-07 to 1976-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Little Darrell Coal Company → No 1 Mine; 1976-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Addair Wayne & Darrell → No 1 Mine; 1976-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Addair Wayne & Darrell → Little Darrell Coal Company; 1976-04-28 to current/open; source msha-controller-operator-history