# Relationship history for MSHA mine 4606344

Current hierarchy: **Mc Million Virgil & Jerry Hatley → Shaker Run Coal Company Inc → Enviro #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Mower Lumber Company → Enviro #2; 1980-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Enviro Energy Inc → Enviro #2; 1981-07-01 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Mower Lumber Company → Enviro Energy Inc; 1981-07-01 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Notrocoal Inc → Enviro #2; 1984-08-01 to 1986-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Orton Hobert G → Enviro #2; 1984-08-01 to 1986-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Orton Hobert G → Notrocoal Inc; 1984-08-01 to 1986-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Grigsby Enterprises Inc → Enviro #2; 1986-11-18 to 1987-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Grigsby Lewis → Enviro #2; 1986-11-18 to 1987-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Grigsby Lewis → Grigsby Enterprises Inc; 1986-11-18 to 1987-04-28; source msha-controller-operator-history
- **operator_operates_mine:** W Va Mineral Development Company → Enviro #2; 1987-04-29 to 1987-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  King → Enviro #2; 1987-04-29 to 1987-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  King → W Va Mineral Development Company; 1987-04-29 to 1987-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Shaker Run Coal Company Inc → Enviro #2; 1987-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Million Virgil & Jerry Hatley → Enviro #2; 1987-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Million Virgil & Jerry Hatley → Shaker Run Coal Company Inc; 1987-09-21 to current/open; source msha-controller-operator-history