# Relationship history for MSHA mine 1515994

Current hierarchy: **Music Dexter → Judex Coal Company Inc → Mine #2**

- 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:** Music Dexter → Mine #2; 1984-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Judex Coal Company Inc → Mine #2; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Music Dexter → Judex Coal Company Inc; 1987-04-01 to current/open; source msha-controller-operator-history