# Relationship history for MSHA mine 4202757

Current hierarchy: **Kris  Papworth → Exspeedia Transport LLC → Spring Canyon Pit**

- 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:** Gerald  Barlow → Spring Canyon Pit; 2021-03-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Perco Rock → Spring Canyon Pit; 2024-03-01 to 2026-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Gerald  Barlow → Perco Rock; 2024-03-01 to 2026-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Exspeedia Transport LLC → Spring Canyon Pit; 2026-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kris  Papworth → Spring Canyon Pit; 2026-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kris  Papworth → Exspeedia Transport LLC; 2026-01-14 to current/open; source msha-controller-operator-history