# Relationship history for MSHA mine 4605458

Current hierarchy: **Mc Million Virgil → Mc Million Enp Inc → Mine No 2**

- 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

- **operator_operates_mine:** Cannon Coal Company Inc → Mine No 2; 1977-04-01 to 1982-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Wasserstrom Barry → Mine No 2; 1977-04-01 to 1982-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Wasserstrom Barry → Cannon Coal Company Inc; 1977-04-01 to 1982-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Erlon Coal Company → Mine No 2; 1982-05-27 to 1986-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Robert H → Mine No 2; 1982-05-27 to 1986-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Robert H → Erlon Coal Company; 1982-05-27 to 1986-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Young Charles → Mine No 2; 1986-05-13 to 1987-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Babcock Mining Inc → Mine No 2; 1986-08-25 to 1987-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Young Charles → Babcock Mining Inc; 1986-08-25 to 1987-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Mc Million Enp Inc → Mine No 2; 1987-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Million Virgil → Mine No 2; 1987-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Million Virgil → Mc Million Enp Inc; 1987-01-15 to current/open; source msha-controller-operator-history