# Relationship history for MSHA mine 0202289

Current hierarchy: **Hills Denver L → Baseline Materials Inc → Queen Creek**

- 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

- **operator_operates_mine:** Baseline Materials Inc → Queen Creek; 1986-02-01 to 1988-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Hills Denver L → Queen Creek; 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hills Denver L → Baseline Materials Inc; 1986-02-01 to 1988-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Pulice W R → Queen Creek; 1988-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pulice Construction Inc → Queen Creek; 1988-12-22 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Pulice W R → Pulice Construction Inc; 1988-12-22 to 1989-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Baseline Materials Inc → Queen Creek; 1989-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hills Denver L → Baseline Materials Inc; 1989-01-25 to current/open; source msha-controller-operator-history