# Relationship history for MSHA mine 1509911

Current hierarchy: **Murray G Dale & Jan Gorgen → Little Hackney Creek Coal Company → No 49 Mine**

- 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 → No 49 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 49 Mine; 1976-08-25 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Cecil → Little Hackney Creek Coal Company; 1976-08-25 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Murray G Dale & Jan Gorgen → No 49 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 49 Mine; 1977-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale & Jan Gorgen → Little Hackney Creek Coal Company; 1977-08-02 to current/open; source msha-controller-operator-history