# Relationship history for MSHA mine 1507212

Current hierarchy: **Noble Hoyt Kevin → Universal Technology Corp → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Mayhew Noah → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Ghee Jack Et Al → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lucky Star Coal Company → No 2; 1974-11-01 to 1977-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Mayhew Noah → Lucky Star Coal Company; 1974-11-01 to 1977-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Deby Coal Company Inc → No 2; 1977-09-12 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Mc Ghee Jack Et Al → Deby Coal Company Inc; 1977-09-12 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Sunoco, Inc. → No 2; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Coal Company Inc → No 2; 1980-01-18 to 1985-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Shamrock Coal Company Inc; 1980-01-18 to 1985-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Universal Technology Corp → No 2; 1985-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Noble Hoyt Kevin → No 2; 1985-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Noble Hoyt Kevin → Universal Technology Corp; 1985-09-30 to current/open; source msha-controller-operator-history