# Relationship history for MSHA mine 2402248

Current hierarchy: **Jacob D Cremer → Perma Stone → Perma 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:** Perma Stone → Perma Quarry; 2001-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jacob D Cremer → Perma Quarry; 2001-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob D Cremer → Perma Stone; 2001-09-07 to current/open; source msha-controller-operator-history