# Relationship history for MSHA mine 1515463

Current hierarchy: **Kirk Morgan Jr → Stonewall Mining Company → Job #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

- **operator_operates_mine:** Stonewall Mining Company → Job #1; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kirk Morgan Jr Et Al → Job #1; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk Morgan Jr Et Al → Stonewall Mining Company; 1985-12-01 to current/open; source msha-controller-operator-history