# Relationship history for MSHA mine 5400197

Current hierarchy: **Roland  Cordero → Arenas Del Oeste → Borinquen Sand MFG.**

- 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:** Cordeco Development Corp → Borinquen Sand MFG.; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas C  Cordero → Borinquen Sand MFG.; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas C  Cordero → Cordeco Development Corp; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Arenas Del Oeste → Borinquen Sand MFG.; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roland  Cordero → Borinquen Sand MFG.; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland  Cordero → Arenas Del Oeste; 1984-01-01 to current/open; source msha-controller-operator-history