# Relationship history for MSHA mine 4200017

Current hierarchy: **Lone Star Industries Inc → Lone Star Industries Inc → Parleys 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:** Lone Star Industries Inc → Parleys Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Portland Cement Company Of Utah → Parleys Quarry; 1950-01-01 to 1986-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Gallacher Edwin S → Parleys Quarry; 1950-01-01 to 1986-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Gallacher Edwin S → Portland Cement Company Of Utah; 1950-01-01 to 1986-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → Parleys Quarry; 1986-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1986-03-11 to current/open; source msha-controller-operator-history