# Relationship history for MSHA mine 3201014

Current hierarchy: **Bruce E  Stahl → Stahl Excavating → Portable Plant, Various**

- 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:** Stahl Excavating → Portable Plant, Various; 2013-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce E  Stahl → Portable Plant, Various; 2013-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce E  Stahl → Stahl Excavating; 2013-07-14 to current/open; source msha-controller-operator-history