# Relationship history for MSHA mine 3503526

Current hierarchy: **Thomas  Vallejo → Applegate Shale Llc → Applegate Shale**

- 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:** Applegate Shale Llc → Applegate Shale; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Vallejo → Applegate Shale; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Vallejo → Applegate Shale Llc; 2001-05-01 to current/open; source msha-controller-operator-history