# Relationship history for MSHA mine 4700924

Current hierarchy: **Dawson Trust dated June 20 2009 → Lannon Stone Products Inc → Richfield 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Lannon Stone Products Inc → Richfield Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James D  Dawson → Richfield Pit; 1950-01-01 to 2022-01-20; source msha-controller-operator-history
- **controller_controls_operator:** James D  Dawson → Lannon Stone Products Inc; 1950-01-01 to 2022-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Dawson Trust dated June 20 2009 → Richfield Pit; 2022-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawson Trust dated June 20 2009 → Lannon Stone Products Inc; 2022-01-21 to current/open; source msha-controller-operator-history