# Relationship history for MSHA mine 0405169

Current hierarchy: **Yen  Richardson; Garry  Richardson; Scott  Richardson → North Star Minerals Inc → Acton Clay Quarries**

- 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:** Yen  Richardson et al → Acton Clay Quarries; 1991-02-01 to 2024-07-17; source msha-controller-operator-history
- **operator_operates_mine:** North Star Minerals Inc → Acton Clay Quarries; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yen  Richardson et al → North Star Minerals Inc; 1991-10-01 to 2024-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Larie K Richardson et al → North Star Minerals Inc; 1991-10-01 to 2024-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Richardson et al → Acton Clay Quarries; 2024-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Richardson et al → North Star Minerals Inc; 2024-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yen  Richardson et al → North Star Minerals Inc; 2024-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garry  Richardson et al → North Star Minerals Inc; 2024-07-18 to current/open; source msha-controller-operator-history