# Relationship history for MSHA mine 1506400

Current hierarchy: **Costain Group PLC → Prater Creek Processing → Prater Creek No 1 Tipple**

- 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:** Hall & Adkins Coal Corp → Prater Creek No 1 Tipple; 1950-01-01 to 1977-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Hall Robert Scott → Prater Creek No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Robert Scott → Hall & Adkins Coal Corp; 1950-01-01 to 1977-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Prater Creek Processing → Prater Creek No 1 Tipple; 1977-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Costain Group PLC → Prater Creek No 1 Tipple; 1977-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Prater Creek Processing; 1977-03-14 to current/open; source msha-controller-operator-history