# Relationship history for MSHA mine 1505491

Current hierarchy: **Costain Group PLC → Costain Coal Inc → Prater Creek Mine #1**

- 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:** Compton Larry P → Prater Creek Mine #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Costain Group PLC → Prater Creek Mine #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Compton & Coleman Coal Company Inc → Prater Creek Mine #1; 1972-02-01 to 1974-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Compton Larry P → Compton & Coleman Coal Company Inc; 1972-02-01 to 1974-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Costain Coal Inc → Prater Creek Mine #1; 1974-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Costain Coal Inc; 1974-03-01 to current/open; source msha-controller-operator-history