# Relationship history for MSHA mine 4700746

Current hierarchy: **Dawson Trust dated June 20 2009 → Lannon Stone Products Inc → West 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

- **controller_controls_mine:** James D  Dawson → West Quarry; 1950-01-01 to 2022-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Halquist Stone Company Inc → West Quarry; 1950-01-01 to 2018-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Halquist et al → West Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Halquist et al → Halquist Stone Company Inc; 1950-01-01 to 2018-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Halquist et al → Halquist Stone Company Inc; 1950-01-01 to 2018-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Lannon Stone Products Inc → West Quarry; 2018-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Dawson → Lannon Stone Products Inc; 2018-12-28 to 2022-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Dawson Trust dated June 20 2009 → West Quarry; 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