# Relationship history for MSHA mine 4503657

Current hierarchy: **Jonathan  Richart → Richart Company, Inc. → Seven Hills 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:** Richart Company, Inc. → Seven Hills Quarry; 2009-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan  Richart → Seven Hills Quarry; 2009-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  Richart → Richart Company, Inc.; 2009-02-24 to current/open; source msha-controller-operator-history