# Relationship history for MSHA mine 2900186

Current hierarchy: **CRH PLC → Superlite Block → Crego 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:** Cstw Inc-Crego Block Company → Crego Mine; 1950-01-01 to 1994-08-15; source msha-controller-operator-history
- **controller_controls_mine:** C S T W Inc → Crego Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C S T W Inc → Cstw Inc-Crego Block Company; 1950-01-01 to 1994-08-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Crego Mine; 1989-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Crego Mine; 1990-02-02 to 2003-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Csr America → Crego Mine; 1994-08-16 to 2003-05-31; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Crego Mine; 1994-08-16 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Csr America; 1994-08-16 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Crego Mine; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Crego Mine; 2003-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Csr America; 2003-04-01 to 2003-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials West LLC → Crego Mine; 2003-06-01 to 2007-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials West LLC; 2003-06-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials West LLC; 2003-06-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Crego Mine; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials West LLC; 2007-07-10 to 2007-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Crego Block → Crego Mine; 2007-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Crego Block; 2007-07-23 to current/open; source msha-controller-operator-history