# Relationship history for MSHA mine 2302550

Current hierarchy: **Michael D  Pursell → Pursell Holdings → MM Quarry**

- 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:** Pursell Holdings → MM Quarry; 2021-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Pursell → MM Quarry; 2021-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Pursell → Pursell Holdings; 2021-10-22 to current/open; source msha-controller-operator-history