# Relationship history for MSHA mine 3401937

Current hierarchy: **Ronald J Richardson Living Trust; Ballerina Sunrise Inc → Flint Rock Products → College**

- 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

- **controller_controls_mine:** Ronald J Richardson Living Trust et al → College; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Flint Rock Products → College; 2004-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald J Richardson Living Trust et al → Flint Rock Products; 2004-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ballerina Sunrise Inc et al → Flint Rock Products; 2004-05-12 to current/open; source msha-controller-operator-history