# Relationship history for MSHA mine 1507273

Current hierarchy: **Murray G Dale & Jan Gorgen → Card Creek Coal Company → Main Shop**

- 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:** Chaney Cecil → Main Shop; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Card Creek Coal Company → Main Shop; 1974-01-01 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Cecil → Card Creek Coal Company; 1974-01-01 to 1977-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Card Creek Coal Company → Main Shop; 1977-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Murray G Dale & Jan Gorgen → Main Shop; 1977-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale & Jan Gorgen → Card Creek Coal Company; 1977-08-02 to current/open; source msha-controller-operator-history