# Relationship history for MSHA mine 5400300

Current hierarchy: **Wilfredo  Ruiz  Nieves → Cantera La Monta�a → Cantera La Monta�a**

- 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:** Cantera La Cadena Inc → Cantera La Monta�a; 1987-12-01 to 2018-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Wilfredo  Ruiz  Nieves et al → Cantera La Monta�a; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilfredo  Ruiz  Nieves et al → Cantera La Cadena Inc; 1987-12-01 to 2018-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Cantera La Monta�a → Cantera La Monta�a; 2018-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilfredo  Ruiz  Nieves et al → Cantera La Monta�a; 2018-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilfredo  Ruiz  Nieves et al → Cantera La Monta�a; 2018-06-04 to current/open; source msha-controller-operator-history