# Relationship history for MSHA mine 4102605

Current hierarchy: **Electro-Phos → Pasadena Chemical Corp → Pasadena Mill**

- 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:** Olin Corp → Pasadena Mill; 1950-01-01 to 1980-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Henske John M → Pasadena Mill; 1950-01-01 to 1980-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Henske John M → Olin Corp; 1950-01-01 to 1980-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Pasadena Chemical Corp → Pasadena Mill; 1980-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Electro-Phos → Pasadena Mill; 1980-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Electro-Phos → Pasadena Chemical Corp; 1980-01-14 to current/open; source msha-controller-operator-history