# Relationship history for MSHA mine 4300184

Current hierarchy: **Omya Industries Inc → Omya Inc → New Haven 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:** White Pigment Corp → New Haven Mill; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Mines Corp → New Haven Mill; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Mines Corp → White Pigment Corp; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Omya Industries Inc → New Haven Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Pigment Corp → New Haven Mill; 1980-09-22 to 1987-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Minerals Corp & Pluess-Staufer Industries → New Haven Mill; 1980-09-22 to 1987-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Minerals Corp & Pluess-Staufer Industries → White Pigment Corp; 1980-09-22 to 1987-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Omya Inc → New Haven Mill; 1987-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Omya Industries Inc → Omya Inc; 1987-09-04 to current/open; source msha-controller-operator-history