# Relationship history for MSHA mine 1511630

Current hierarchy: **Geo-Energy Ltd → Bledsoe Coal Company Inc → Mine No 4**

- 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:** Cardinal Resources Inc → Mine No 4; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → Mine No 4; 1978-10-01 to 1980-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1978-10-01 to 1980-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Bledsoe Coal Company Inc → Mine No 4; 1980-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Geo-Energy Ltd → Mine No 4; 1980-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geo-Energy Ltd → Bledsoe Coal Company Inc; 1980-08-11 to current/open; source msha-controller-operator-history