# Relationship history for MSHA mine 1515283

Current hierarchy: **Bruner Michael → Black Jack Coal Company → No 1**

- 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:** Bruner Michael Et Al → No 1; 1983-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Jack Coal Company → No 1; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruner Michael Et Al → Black Jack Coal Company; 1985-07-01 to current/open; source msha-controller-operator-history