# Relationship history for MSHA mine 4404458

Current hierarchy: **Jordan Dave → Excalibur Ltd → #1 Prep Plant**

- 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

- **operator_operates_mine:** Corcol Energy Inc → #1 Prep Plant; 1976-05-01 to 1985-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Karle Walter Et Al → #1 Prep Plant; 1976-05-01 to 1985-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Karle Walter Et Al → Corcol Energy Inc; 1976-05-01 to 1985-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Excalibur Ltd → #1 Prep Plant; 1985-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jordan Dave → #1 Prep Plant; 1985-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jordan Dave → Excalibur Ltd; 1985-06-10 to current/open; source msha-controller-operator-history