# Relationship history for MSHA mine 1600188

Current hierarchy: **Lone Star Industries Inc → Lone Star Industries Inc → Lone Star Industries New Orleans Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Lone Star Industries Inc → Lone Star Industries New Orleans Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Okc Corp → Lone Star Industries New Orleans Plant; 1950-01-01 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_mine:** OKC Corp → Lone Star Industries New Orleans Plant; 1950-01-01 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_operator:** OKC Corp → Okc Corp; 1950-01-01 to 1980-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → Lone Star Industries New Orleans Plant; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1980-10-20 to current/open; source msha-controller-operator-history