# Relationship history for MSHA mine 4502605

Current hierarchy: **Cemex S A → Pacific Rock Products LLC → Washougal Aggregates**

- 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:** Zimmerly Rock Products → Washougal Aggregates; 1978-03-09 to 1997-06-15; source msha-controller-operator-history
- **controller_controls_mine:** David  Zimmerly → Washougal Aggregates; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Zimmerly → Zimmerly Rock Products; 1978-03-09 to 1997-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Washougal Aggregates; 1988-07-20 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Washougal Aggregates; 1994-08-16 to 2003-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Csr America → Washougal Aggregates; 1997-06-16 to 2001-09-30; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Csr America; 1997-06-16 to 2001-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials → Washougal Aggregates; 2001-10-01 to 2007-07-31; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials; 2001-10-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Washougal Aggregates; 2002-09-26 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Washougal Aggregates; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Washougal Aggregates; 2003-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Csr America; 2003-04-01 to 2001-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Washougal Aggregates; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials; 2007-07-10 to 2007-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Pacific Rock Products LLC → Washougal Aggregates; 2007-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Pacific Rock Products LLC; 2007-08-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Pacific Rock Products LLC; 2007-08-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Pacific Rock Products LLC; 2007-08-01 to current/open; source msha-controller-operator-history