# Relationship history for MSHA mine 4202731

Current hierarchy: **Nikolas  Simpson; Jason  Bennett → Forward Development Group → Rockwell 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

- **operator_operates_mine:** Forward Development Group → Rockwell Pit; 2021-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nikolas  Simpson et al → Rockwell Pit; 2021-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nikolas  Simpson et al → Forward Development Group; 2021-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Bennett et al → Forward Development Group; 2021-09-15 to current/open; source msha-controller-operator-history