# Relationship history for MSHA mine 0200181

Current hierarchy: **CRH PLC → Oldcastle-Superlite → Darling Mine**

- 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:** Superlite Builders Supply Inc → Darling Mine; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_mine:** U S Industries Inc → Darling Mine; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_operator:** U S Industries Inc → Superlite Builders Supply Inc; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Superlite Builders Supply Inc → Darling Mine; 1986-07-22 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Darling Mine; 1986-07-22 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Superlite Builders Supply Inc; 1986-07-22 to 1989-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle-Superlite → Darling Mine; 1989-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Darling Mine; 1989-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle-Superlite; 1989-05-25 to current/open; source msha-controller-operator-history